Lena Luthor

"Loss does strange things to my family and I have lost a lot of people. I think when I feel things again... I'm going to be very, very afraid of the person I might be."

- Lena Luthor

Lena Luthor (born 1993) is the billionaire CEO of L-Corp and the owner of CatCo Worldwide Media; after buying it to ensure that it would remain a fair and unbiased company. Lena is also the daughter of the late Lionel Luthor and a late unnamed woman, the step-daughter of Lillian Luthor, the paternal younger half-sister Lex Luthor, the ex-girlfriend of the late Jack Spheer and the best friend/ally of Kara Danvers and her alter-ego Supergirl. Despite this, she is currently unaware that the two are one-and-the-same. And in a similar vein, Lena also befriended Samantha Arias, whom she was acquainted to from long prior, and likewise oblivious that the latter is also secretly the Worldkiller, Reign.

Early life
Lena was born in 1993 in Metropolis to the billionaire Lionel Luthor and an unnamed woman with whom he was having an affair. After the death of her biological mother, when she was four, Lena was adopted by the Luthor family. However, despite being loved deeply by her half-brother Lex, who made her feel especially welcomed in the new family, and her father Lionel, who considered her his favorite, Lena had a difficult upbringing with her adoptive mother Lillian, who never considered her a "real Luthor" and always favored Lex over her. Also, the truth about her parentage was left unknown to her and she was convinced that she was simply adopted.

Lena went to boarding school with Veronica Sinclair, but she never really got along with her. Later she graduated from MIT. In their youth, she and her half-brother Lex used to be very close but, as adults, Lex grew cold, power-mad and delusional; when he started targeting Superman she grew concerned for his well-being and tried to help him, but he ignored her and proceeded with his plans to destroy Superman, resulting in the deaths of many people. This unsurprisingly only worsened Lena’s self-perceived existence as a pariah, who already had to endure much from her connection to the very affluent but controversial Luthor family responsible for adopting her, from which her supposed adoptive and infamous older brother also hailed.

In 2012, at the age of nineteen, she met Jack Spheer and began working with him to try and find a cure for cancer and other diseases using nanotechnology. After three years, Lena and Jack fell in love with each other and started a romantic relationship ; however after her half-brother, Lex, was sentenced to 37 life terms in prison, Lena interrupts any contact with her mother, took over as the CEO of LuthorCorp, moved to National City to helm the company, and immediately set about atoning for her brother's crimes ,thus ending her relationship with Jack, who did what he could to try and get Lena to stay together with him in Metropolis. But she would not be dissuaded; they did not part on amiable terms.

Transforming LuthorCorp into L-Corp
Lena was given the opportunity to travel on the suborbital spacecraft Venture but had to back out at the last minute due to an important business meeting regarding the renaming of her company. After the spacecraft exploded, Clark Kent and Kara Danvers — in their civilian guises — ventured to LuthorCorp to investigate her after receiving a tip from the D.E.O. that the company owner may have had a hand in the space-craft’s maiden flight disaster, scanning her entire personal office via x-ray vision while Lena wasn’t looking and explaining her intents and goals with her family’s company. However, she urged that she had nothing to do with the Venture incident, simply wanting to start anew outside of her family, of which she has a lot of arduous work ahead of Lena given the depths of how far the Luthor name sank on account of her brother, and giving the two a flash drive with information on the Venture's destroyed oscillator that a subsidiary of her company had manufactured; she didn’t knew it then, but the words that Lena imparted to the Kryptonian cousins, prior to handing them the stored digital data, will have a lasting effect on Kara herself and influencing the other woman into making a huge decision. Thus developing a high opinion for Lena from then and later onwards. Later that day she boarded a helicopter. However, before the helicopter could get very far, two drones appeared, controlled by mercenary John Corben, and targeted Lena. Supergirl and Superman intervened, preventing Lena from being shot whilst airborne. The latter went looking for more drones, while the former (with some difficulty) took out the two angling Lena's chopper, helping it land safely while informing Lena that someone was trying to kill her.

The following day, at a presentation unveiling Lena's intention to re-brand LuthorCorp to L-Corp, Kara walks alongside of her, trying to convince Lena from carrying on with the re-naming ceremony; but Lena would not be deterred, explicitly stating that she does not wish her family’s company to be remembered as her brother’s mere implement that he used as a front in his madness to destroy Superman. While Lena continued her speech at the podium a number of explosions occur, causing her to run to safety. She encountered who she initially thought was a police officer, but was revealed to be John Corben, a mercenary hired by Lex Luthor to kill his adopted sister. Alex Danvers helped to hold him off, but she was overpowered. Before he could escape, Lena nearly fatally shot him. The day after, Clark and Kara visited Lena's office and she offered her thanks for a pleasing article about L-Corp published in the Daily Planet, but wonders as to why Kara’s name wasn’t printed on the byline along with Clark’s. Receiving a modest answer from Kara, Lena notes that she sensed the former to bear the presence of a competent journalist, from the moment of their first encounter, and hopes to see more of Kara in the future. And Kara concedes, leading to her returning later into CatCo and stating to Cat Grant of her desire to take up journalism at the latter’s editorial outlet.

Befriending Kara
When the US President came to National City to sign a decree on the Alien Amnesty Act, Kara came to Lena as she needed a comment from "the sister of the (world’s) most famous alien-hater". She produces a handheld, thumbprint scanner-like tool from a small vault in her office and proudly tells the reporter that L-Corp is developing a new and high-tech commodity capable of identifying aliens, though emphasizes that they were still in the prototype stage in regards of that, but will soon be perfected and ready to be mass-produced for the market in time following the Act’s enactment. Lena then uses it on herself as demonstration before offering Kara the device to test it. Cautious of the contraption outing her then and there for her true Kryptonian nature, Kara attempts to dance around the subject, mildly debating with Lena that singling out aliens who would then be living in the general population like this would defeat the unspoken purpose, for racial and inter-planetary acceptance, behind the President’s official Act due to be signed. The lucrative profitability to be certainly yielded from such a device aside, Lena genuinely believes that people on Earth have the right to know who is an alien and who is not since extra-terrestrials, both benevolent and otherwise, will soon indiscriminately have legal rights on par with the planet’s human denizens in the wake of the Act’s signing. But unlike Lex, Lena intends to launch the tech to the public for everyone’s safety and benefit; therefore, she plans to put the device in all the country stores, in spite of Kara expressing her insubstantial disagreement at Lena’s intended undertaking. When Lena turned, Kara used her laser vision to sabotage the device and then agrees to test it, so it gives a negative result.

Later Kara came back to Lena, who warmly praised her for her wonderful article, but admits she initially thought that Kara would "mix it with mud" because of their differing views on alien-on-Earth lifestyle, which was clear as day for Lena when she showed Kara her piece of alien-detection technology during the reporter’s earlier visit. Kara confesses that she would have written so, had her editor not disapproved of her initial draft, but was now glad that Snapper did since recent developments made her better appreciate Lena’s intent in providing people with a way of rooting out the non-humans among the populace. Bringing up her past with Lex, Lena then notes that some people are inherently evil, even if their ill intents are not obvious at first, and that those closest to them are also sadly the ones hurt most once the former show their true colors; protecting oneself from them is all that can be hoped for.

A few days later, Kara came to Lena to ask her if she knew where Veronica Sinclair would be hosting her next alien fight club, practically barging in to Lena’s office and, seeing the reporter’s desperation, Lena instructs her assistant that an unfettered access channel for Kara Danvers, towards the company CEO’s office, was to be optionally provided for Kara whenever the reporter was spotted straight from the lobby — leaving both Kara and the assistant flabbergasted. After the assistant left to arrange that, Kara (somewhat callously) went ahead and informed Lena of her current predicament: a “friend” of hers was taken by people operating outside of the law and, given Lena’s widespread family connections, she was Kara’s best chance of finding those people in order to mount a rescue. Lena guesses at once that the people in question are none other Veronica Sinclaire’s acting out at the latter’s beck-and-call; and as a Luthor, Lena was invited, although, she presumably wasn't aware that Sinclair has expanded her enterprise to include alien competitors, both willing and coerced, taking into account the recent signing of the Alien Amnesty Act that was now allowing aliens residing on Earth to walk freely in National City, albeit still trying to find their proper places within the domain. However, Lena stated that she was never interested in Roulette's kind of "entertainment" from the start and that her family was only one of many supposed, publicly unscrupulous circles that Sinclaire reach out to for profit. Lena wrote down and gave the address to Kara, who thanked her and said that she owed her a great debt, to which Lena replied that she did not, as she knows that she would help her when the time came.

Later, Lena comes to CatCo and invites Kara to a charity event to raise funds for a children's hospital as she was practically the only bonafide friend Lena had in National City; and in extending the invite, Lena acquaints herself with Kara’s new co-worker “Mike Matthews”. The next day, Lena — who presumably deduced a close correspondence between her friend and the city's alien protector after noticing the connection between Supergirl's taking down of Sinclair's fight club operations not long after she herself handed the coordinates to Kara — came to Kara's apartment (where she catches Alex talking with Kara and learning the fact that they are adoptive sisters) and asked her to arrange a meeting with Supergirl, so, in the evening, Kara arrives at Lena's L-Corp office in the guise of Supergirl. Lena invites her to the same party in the case of gang attacks. Supergirl expressed her disapproval for the proceedings of the event, as it was a liable target for Chet Miner and his gang of extra-terrestrially-armed gang of robbers; apparently, even the Kryptonian was having her doubts if it was within her ability to foil them should it come to that. Noticing Lena's determination to carry on, a curious Supergirl inquires of the businesswoman's motives and Lena points out in response that National City's extra-terrestrial superheroine actively goes out of her way to aid the city's residents and beyond, with little to no personal gain for herself, and so Lena asks if it was a burden that only Supergirl was allowed to bear. She challenges if, given Superman's history with her brother Lex, Supergirl was among those who believes that there was no such thing as a "good Luthor". Receiving a commendable response from the disguised Kara, Lena was elated when the former promises to be there at her gala, and watches as she left, flying off from her balcony.

The next evening, Kara and Winn (who brought along a device to warn them ahead of time should Miner’s gang show up) arrive at the charity event, where Kara supports two conversations at once with Lena, both as Supergirl and in her civilian identity, by using her super-speed to rapidly change her clothes so Lena doesn’t catch sight of both personas at once, but did not appear to think much of it outside of both Kara and Supergirl, like Lena, not glimpsing upon each other at the same time. After some time, a gang of criminals crashes the party starting a struggle with Supergirl. Winn hides under one of the tables where he meets Lena, who was busily trying to establish a black burst generator that she prepared beforehand, which would cut down their weapons and leave the robbers vulnerable. Winn realizes that Lena arranged the gala as a trap to lure the criminal gang and the latter admits so; but her ploy would ultimately go south if the device she brought fails her that night. All that was left to do was for Supergirl to dispatch them and that may only happen once Lena disables their weaponry with her black burst generator, though she was having trouble with it, as Winn noticed. Together they were able to complete the device, destroying the criminals' weapons so that the gang would be captured. She and Winn would then finally emerge from under the table they have taken refuge in and everyone there notices them straightening themselves, with Winn making a half-baked explanation that he and Lena weren’t doing anything inappropriate while they were obscured by the table cloth — much to the amusement of Kara and James. In the evening Kara, in the guise of Supergirl, flew back to Lena thanking her for her help; at this point, Lillian Luthor enters her daughter's office and Kara leaves. Lillian apologizes for having missed her daughter Lena's party, but her absence does not faze Lena, who responds somewhat coldly.

Her name would later be brought up by a captive Supergirl in her conversation with Lillian Luthor. Bested by the real Hank Henshaw (revealed to be alive and now cybernetically-enhanced) and then thrown, close to Mon-El, into adjacent enclosures that even the two of them cannot break out of, the Daxamite and Kryptonian were later visited in their captivity by the Head of Cadmus herself. Recalling her passing encounter of the older woman once in Lena’s office, Kara inquires why she saw her with the CEO of L-Corp that night and Lillian repressively reciprocates the question, not the least bit thrilled with the idea that her daughter was receiving nightly visits from the cousin of the man who sent Lena’s brother in prison.

Realizing that the person before her was Lena’s foster mother, but apparently not thinking even remotely worst of Lena herself, Supergirl demands to know if Lena knew what Lillian was doing at the helm of Project Cadmus — showing an underlying foundation that Kara wholeheartedly trusts Lena enough to not believe (or at least jump to the immediate conclusion) that the latter could secretly be part of Lillian’s organization. Lillian would only allude that she and Lena do not normally see eye-to-eye, but vehemently demanded in turn as to who Supergirl was in regards to her daughter, scoffing at Kara’s blatant claims of being Lena’s friend having heard a similar line from Superman in regards to Lex and then stressing where that very friendship between her son and Kara’s cousin brought the two of them in the end — with Lex vilified and in prison while Clark (as Superman) was exalted as Earth’s greatest hero and at the former’s expense. Kara did not seem the least moved or shaken by Lillian’s monologue, who appeared to justify her endeavor of not seeing Lena suffer at Supergirl’s hands what Lex did at Superman’s, by doing her part at dealing away with the aliens in her own way.

Medusa
Right after Thanksgiving (featuring a space-time breach that momentarily tore open over the dining table at Kara’s place), Kara, Alex and their friends went back to the D.E.O. where they discussed what to do with Cadmus, now aware of Lillian’s role in its higher chain of command and wonders how much her daughter possibly knows concerning that. Though she personally finds it unlikely that Lena would be able to provide any knowledge on Lillian beyond familial matters, Kara eagerly volunteered to investigate L-Corp herself on behalf of the agency, insisting that her civilian guise as a reporter — and her so-called “sneakiness” — was enough to gather intel from Lena, and thus asks her agency colleagues to stave off their usual cloak and dagger methods of discreetly gathering information (i.e. bugging phones, hacking company records, etc.). Unbeknownst to Kara, Alex has Winn prepare such underhanded methods anyway, telling him to have them at the ready soon after Kara left.

When Kara comes to L-Corp asking Lena about her mother, the latter says they did not have a very good relationship and often disagreed. However, Lena soon notices at once that Kara was trying to glean information on Lillian through her, and after Kara's departure, Lena calls her mother and says they need to talk. As Lillian comes, the two of them exchanged some snide comments before Lena tells her that a reporter is investigating about her, and asks if she's hiding something. Of course, Lillian knows at once that the reporter in question was none other than her former Kryptonian captive but instead says that she has no idea; Lena realizes that her mother is lying, however, as it certainly was not the first time this happened.

Later Cyborg Superman comes to L-Corp, in an attempt to steal a rare synthetic substance that Cadmus needed to spread the Medusa Virus, but Supergirl arrives and a fight between the two ensued. Lena comes to the site of their fight and, noticing her, the cyborg throws her the detached ‘L’ of the company’s scaled-up three-dimensional logo. Kara manages to cover her and asks her to leave. After a while Kara returns to Lena's office in the guise of Supergirl and Lena graciously thanks her for saving her life, then Supergirl reveals to her that her mother runs Cadmus. Hurt, Lena refuses to believe it, accusing the superheroine to be no different than anyone who readily condemns the Luthors' disposition and morality because of their family name, wondering before how long until she sees Lena herself in a similar light, and asks Supergirl to leave. But before she does, Kara imparted a few inspiring words to the CEO, that she honestly believes Lena to be a better person than anyone else in the Luthor family. The sole flickering light of morality to their prevalent darkness, and so Lena must shine through as her own hero if she were to ever get out of Lex and Lillian’s villainous shadow — and that got Lena into thinking.

Later, Lena organizes another meeting with her mother at L-Corp and confesses she knows Lillian runs Cadmus. Then she says that if she wanted her help, all Lillian had to do was ask for it shall be given by Lena; and she gives Lillian Isotope 454, the substance Cadmus needed to initiate the Medusa Virus into a city-wide outbreak effect. Lillian was surprised at Lena sudden and out-of-the-blue willingness, and the latter tells her that perhaps it was time for Lillian to get to know her daughter better.

After that, they left for the National City port, where they intend to release the virus with a rocket launcher. Lillian, as a means to test her daughter's loyalty to Cadmus, gives Lena the key to activate it. Just as she is about to do it, Martian Manhunter and Supergirl arrive to stop her, having been alerted by their agency’s sensors of the Isotope 454 portion, provided by Lena to her mother, being moved from L-Corp to where the Luthor women now are. Supergirl attempts to talk Lena out of releasing the virus but the latter conforms to her tainted family legacy, remarking that she is "a Luthor", and launches the rocket. Supergirl flies after it while Martian Manhunter confronts both Lillian and Lena, and forcibly battles Cyborg Superman who interfered to prevent the Luthors from being apprehended. Lillian makes the rocket explode before Supergirl could act, spreading the virus across the sky. However, none of the aliens in the city were affected. Lillian realizes that Lena substituted the isotope for one that would instead render the virus inert. Lena condescendingly confesses and reveals that she also called the police, who were incoming (in their service vehicles, sirens and all) to arrest Lillian. After that, Lena presumably provided the D.E.O with an unaltered sample of Medusa, which was crucial in curing J’onn from his condition of gradually becoming a White Martian after a blood transfusion from one.

Kara's trust
When Lena testified against her mother for her actions as the leader of Cadmus, the media was divided between calling her testimony the rant of a scorned child, or the bravery of a hero — though some also called her a bitch. Kara (with some snacks in tow) visits Lena to learn that Lillian is desperate to see her daughter that she had the message passed on through her lawyers who relayed it to her daughter, but Lena does not want to go and seeks Kara's counsel. Kara puts her own biological family’s present status into perspective (omitting that they were aliens who met their ends on Krypton, of course) and suggests that Lena visits the prison, despite their estranged relationship, as Lillian was still her mother and that Lena was fortunate to still have hers in her life.

Lena goes to the prison to see her mother where Lillian reveals that Lena is Lionel Luthor's illegitimate daughter. Her mother was a woman Lionel was having an affair with and then paid off to disappear with the intention to start anew with Lillian. However, four years later, his mistress died and Lionel decided to adopt his four-year-old daughter. Neither Lionel nor Lillian revealed to Lena or Lex that she was an actual Luthor growing up, shocking Lionel’s daughter of this revelation, which Lillian further uses to guilt a distraught Lena into supporting her mother. She tells her to have her back, as the only two Luthors left; they hold hands over the table separating them. The next day, Metallo uses synthetic Kryptonite to break him and Lillian out, and the moment it happens, fingers point to Lena when it was learned that she visited the very prison where Corben and Metallo were imprisoned in last night — the only brief time interval wherein Corben could have acquired his empowering substance.

Kara attempts to warn Lena in the latter’s office about these rising allegations when the NCPD, led by Detective Maggie Sawyer, arrives to arrest Lena with video footage revealing that she had recovered Kryptonite the day prior to the escape, in spite of a protesting but ignored Kara taking Lena’s side. Stripped of her privileges and sent to incarceration, Lena's arrest makes the headlines, and the stigma of being a Luthor is heightened with the people, like the correctional officers at the penitentiary that Lena was being kept at, commenting on how she is just like her brother (or will be). The only one exempt from this belief is Kara, who confronts her friends and sister about their lack of faith in a woman who has done nothing but help them. As the one most insistent on Lena’s transgression, James Olsen leaves to find proof that Lena is guilty, anticipating and discovering that Metallo returned to the prison that evening to break Lena out. Metallo succeeds, having battled and defeated James, in the guise of Guardian, and went over to tear the bars off from Lena’s cell. Lena, who went close to her cell’s threshold in response of the ruckus between Metallo and Guardian, could only look on fearfully at the arrival of the Kryptonite-fueled cyborg that she herself had once shot from behind, and left in a critical state, from back when he was still a normal person. Metallo, however, merely apologizes for the delay.

Metallo reunites Lena with Lillian, who tells Lena that no one would believe her now that she, too, escaped police custody. She tries to use this as a means to goad Lena into joining Cadmus, saying the public would never offer redemption to a Luthor and that her efforts to prove otherwise were pointless. Lillian divulges that this is the only way for them to be a family again, as fugitives on the run — the thought of which Lena understandably did not find too promising at all. Lillian takes Lena to a secure location where a customized weapons’ vault created by Lex, which has to be opened with someone from the Luthor bloodline (evident by the biometric lock that Lena instantly recognized), was located. Lena (somewhat disgustedly) thinks that meant Lillian also obsessively kept and brought along a sample of Lex’s genetic material, with which his mother intends to use in accessing her son’s vault, but Lillian clarifies that the means of access does not have to come exclusively from Lex, given how he designed the biometric security around it as anyone having or sharing Lex’s genetic markers would be able to bypass the said security if they only know how; her daughter denotes that this entire plan was never to tie loose ends between the two, but to bring her to Lex's vault so that Lillian could gain access to whatever’s inside, since it was much easier to get to her than it would be with the incarcerated Lex, the only other living person of Luthor blood still in existence, under maximum security. Lillian admits so but also insists, concerning Lena and her biometrics, that neither necessarily invalidates the other, and so she is making ends meet as her mother. Lena refuses and backs away, wanting to take her chances with a possible life sentence instead of assisting her mother and Cadmus in their war against non-humanity, but is forced to open the vault by the real Hank Henshaw, revealing that it was indeed filled with anti-alien weapons; a majority of which Lillian was already intimately familiar with, marveling at her son’s brilliance and cunning for having amassed such an impressive collection of weaponry to use against the likes of Superman. Her daughter remarks that she was worse than Lex, but Lillian assures Lena that she will be remembered righteously in history, as will Lena for joining her, in the end. And of the many secured articles found inside that vault, that Henshaw and Corben were beginning to retrieve, one-by-one, and be transferred elsewhere, Lillian’s attention was ultimately caught by a small, handheld box; walking over to it and partly lifting off its lid, Lillian displays both awe and reverence at the sight of the content(s) inside, much like an appraising curator beholding a prized masterpiece about to enter and be added to the private collection, remarking how Lex finally perfected “it”. Lena could only look on, slightly disturbed, at how her mother was behaving.

Supergirl comes to the rescue — much to Lena’s expressed shock that the former, of all people, would come to save her from Lillian — bursting down through the ceiling and announces that Kara Danvers asked her to help as she believed in her. Lillian activates one of the weapons she took from Lex’s vault, a handheld canister-like device, and threw it at Supergirl, who catches it. An unwise move, for she quickly realizes that it was a sonic-emitting device that overwhelms her Kryptonian acute auditory perception, immediately bringing Supergirl to her knees. With her incapacitated and rendered defenseless by the modified high-pitched noise, a pleased Lillian instructs her cyborg henchmen to entrap the helpless Supergirl into the vault as well. Lena tries to intervene, desperately begging her adoptive mother to leave the alien be, only to be promptly ignored by the latter; Henshaw grabs her then throws her down, knocking Lena out. But even whilst being dragged to her doom, Kara would not be deterred and informs them that the synthetic Kryptonite in Metallo's chest is volatile and would shortly explode, killing them all. Kara heat-visions the sonic-emitter, but still had a hard time fighting Metallo, who repeatedly strikes her with streams of weaponized radiation from his said equipped Kryptonite, weakening Supergirl enough for Metallo to overpower her in melee, getting her on her knees again and pinning her arms behind her. With J’onn’s unexpected aid, she escapes in time with Lena, who fills Kara's office with thank-you flowers the following day after she learns that Kara not only sent Supergirl to rescue her, but she also managed to prove that the incriminating footage was falsified. Lena thanks Kara when she visits later, commenting that she wasn't just her friend, but her hero, too.

One day, Kara bumps into Lena at CatCo having forgotten that the two were scheduled for a public outing. Kara expresses her frustration in trying to get a warning out that Cadmus was abducting aliens after the terrorist organization stole the National Alien Registry. Snapper Carr wouldn't publish the article without a second viable source apart from Supergirl who, in turn, cannot reveal the existence of the D.E.O. for security reasons. Seeing that Kara was in a sticky wicket, Lena suggests she write a blog to get the news abroad. She also volunteered to check into her company's history as her mother had been on the board when Lex was the CEO and might have left a trail. Lena discovers a LuthorCorp facility that was supposed to be defunct yet her company was billed for its utilities. She asks her assistant for the records, who is a Cadmus mole unbeknownst to Lena. The assistant calls Lillian who tasked two goons to capture Lena, who was communicating with Kara via phone, in her own office but they fail thanks to Supergirl’s arrival, passing off her timely rescue as being there together with Kara when she was conversing with Lena through the phone; Lena then informs Supergirl where the abducted aliens are most likely being held.

Biomax and working with Queen Rhea
Weeks later, Lena receives a personal invite from Spheerical Industries' CEO, Jack Spheer, for her to attend his press conference about a new technology. She visits Kara at her apartment to ask if she could attend the presentation with her as support, revealing that she and Jack were romantically involved for two of their five years together, just before she moved to National City. She reminisces about the good times she spent with Jack as they journeyed to find a cure for cancer in a garage, but found the prospect of having to attend the press conference alone challenging as they ended on a bad note. Kara agrees to go to make it bearable for Lena to face. At the presentation, Jack awes his attending audience as he showcases his newly-designed nanobot technology that is able to cure any medical ailment, such as injuries or diseases, revealing that he perfected his and Lena's project, Biomax, which Lena is insanely proud of. Jack wishes to catch up with Lena, asking her to dinner after the press conference but the company's CFO, Beth Breen, tears him away before she can answer. He then appears at Lena's office at L-Corp to ask her again, which she declines. Jack thinks she may be mad at him for having cracked Biomax on his own, to which she says she wishes the best for him. He then asks her about her life in National City before delving into the good memories of their relationship and then asks to go to dinner again after confessing that he missed her. Lena agrees on the account that the occasion is non-romantic, just for the sole purpose of catching up with each other.

She later tries to call Kara to ask her to talk her out of the dinner but left a message with Mon-El as she was not there (she was following up Snapper on a lead regarding Biomax). However, when Kara, who barely saved Snapper from the same nanobot swarm that killed the second Biomax lead who tried whistle-blowing Jack’s company, like it did with the first, learns about the dinner upon returning, she brings Mon-El to the restaurant Jack and Lena were eating at. It's clear as day to Lena that Kara is investigating Jack about Biomax, which leads her to ask how he perfected the project. His story denotes that his breakthrough only came after he realized that he should have gone with Lena to National City, endearing Lena at knowing that some good did came from the breakup. Kara attempts to press on with her investigation but Lena kindly asks Kara and Mon-El to leave them alone so that they may speak. They leave for L-Corp where Jack apologizes for making Lena's decision to move more difficult, that he wishes he had rather said that he could make space for her and his work.

Lena understands, confiding in him how she wonders whether her life and legacy may have turned out different had she stayed with Jack. They kiss but then Jack seems to zone out and tells her that he needs to go and then leaves her abruptly. The following morning, Lena was combing fondly at images of her together with Jack, through her personal office computer, when Kara comes in and informs Lena that the Biomax human trials were faked and that Jack was covering it up, that he had used it on himself and was using the nano-robotic swarm to eliminate possible leaks; and seeing Lena getting defensive and having doubts to the allegations, as proof, she even showed Lena the video solidifying her word against Jack. Kara wanted her to know but makes her promise she won't confront him. Lena defies that, however, and meets Jack in his research lab at Spheerical informing him that she knows about the falsified trials and that he's killed two people with Biomax to eliminate any further leads to the subterfuge. Distraught, she demands to know how could he sink so low, but Jack has no idea what she's talking about, ultimately making Lena realize Jack’s honesty on the spot. He suddenly became emotionlessly unresponsive and unmoving from where he stood, and Beth Breen appears behind him wearing a technological single earphone and simultaneously addressing Lena, revealing that she has been using the Biomax, administered by its maker into himself, in order to control Jack. Apparently, Jack intended to shut down Spheerical Industries after realizing the underlying risks in using Biomax; but with so much finance at stake, Breen had abscond some of the company’s technology and then used it to control Jack against his will, hence allowing Biomax’s launching to the open public unimpeded. After some cutting remarks on sexism (and how Lena was basically constrained with having to correct the otherwise irredeemable transgressions of her brother, Lex, “cleaning up” after his faults), she reveals to Lena her aim to spread Biomax availability not just for civilian usage, but also extending to medical and military factions and entities alike who will be invested in its applications — ignoring Lena’s repressed protests. Lena thinks Breen was about to have the controlled Jack kill her, as that was the only reason Beth could be divulging to Lena her “evil plan” in true Bond villain-style. But Beth stresses that as not her intent; not when she could profit further with Biomax by planning to use it on Lena to control her and L-Corp, as she had with both Jack and Spheerical, thereby merging Beth's company with Lena's. She then orders Jack to take and use a Biomax-filled injector gun on Lena to bind her with the nanobots, terrifying his lover, who backs away from the advancing Jack.

Supergirl unexpectedly comes into the mix of things, rescuing Lena and forcing Beth to release the Biomax swarm from Spheer’s body to combat Lena and Supergirl. Kara thinks Lena should run, leaving her with the swarm without having to worry about Lena as well; but Lena insists on staying, coming up with a plan of her own and asking Supergirl to preoccupy the nanobots while Lena herself goes after the root of the problem — Breen. Supergirl did as told and flew around trying to outmaneuver and fight the Biomax, only to be eventually caught and pinned to some lab equipment by the said swarm, helpless and gradually being engulfed by the nanobots, suffocating her, while Lena brawls with Breen, disarming her of the earpiece that controls Jack and destroying it. With Jack suffering agonizing pain from the now out-of-control nanobots still within him, and Supergirl slowly dying too, Lena attempts to override the Biomax mainframe through the computer system in Spheerical’s lab. However, Breen tells her that the nanobots have merged with Jack's body and that overriding the mainframe destroys the nanobots and kills Jack, earning Breen an elbow to the face from the Luthor. Begged by Jack to end his misery, Lena apologizes and reluctantly chooses to override the mainframe, saving Supergirl at the expense of Jack; Kara can only sympathetically gander at whom and what the bereaved Lena had to sacrifice to save her friend from the nanoswarm. Kara visits Lena the next day, bringing flowers to the latter’s office and wishing she could do more to ease Lena’s pain but was told by the grieving CEO that her presence was enough. Lena explains that she feels cold and calm like her mother after Lex's incarceration, with the only consolation being the thought of Breen dying in her cell — which startles Kara. Lena continues, saying that loss does strange things to her family and she personally lost a lot in her life even before she was recognized as a Luthor, thinking that whatever may happen within the span of her mourning could mold her into something she will one day fear. Kara hugs and assures her that she will never let anything happen to her, that she is there to protect her forever and always. As she is watching the city from her office that night, she is visited by Rhea who tells her that she has come with a proposal.

Rhea had given Lena the design schematics for a transmatter portal. Lena was excited at the possibilities and benefits that such a device could have on the world though she knew that it was presently just a theory. Rhea told her that it was possible and then revealed that she didn't tell Lena all of her secrets towards the design as she wanted to gauge her interest before trusting her with them. Lena told her that she was very interested and Rhea agreed to share them. They went off to have dinner together where Rhea gave her a thumb drive with the remaining pieces of the schematics for the device. Rhea then said that her mother must be quite proud of her but Lena told her that she and her mother don't speak to one another anymore especially after her attempts to frame her. Rhea told her that she was surprised as she believed that a mother-daughter relationship was a strong one. She told Lena about her son and that she loved him deeply but then he had fallen for a woman that went on to take her from him and after which her husband was killed. Lena was then visited by Rhea again as she was going over all the new data for the portal. Lena told Rhea she was arranging for security to let her have access to her office but she just needed her thumbprint. She then moved her alien detection device for Rhea to use, under the guise that it would register her thumbprint, and saw the device indicate that the latter was an alien. When Rhea asked why the device acted the way it did, Lena dismissed it before she told Rhea that she had reviewed her design and realized that it would need an element that didn't exist on Earth. She then revealed that she knew that Rhea was an alien — a fact she suspected when Rhea gave praise “to the gods” during her dinner at the restaurant with Lena, since polytheistic practices have long since died out by the time of Earth’s Modern Era, and then just confirmed with the extra-terrestrial discernment device. Lena angrily told her that she wouldn't build anything for her and that she wanted her out of the building. Rhea then left without another word. Later on in the evening, Lena was visited by Rhea who told her that the reason she lied about being an alien was because she had been aware of her mother's reputation and couldn't be sure that she wasn't the same way. Lena spitefully told her that many people automatically assume that she was a certain way because she was a Luthor. Rhea then told her that her proposal was genuine and she did want to work with her and hoped that Lena would reconsider; she then teleported out of her office to leave Lena to her thoughts. Lena tried to call Kara for her opinion, but Kara told her that it wasn't a good time as she was in the middle of a crisis of her own.

Later, Kara was called by Lena and she asked if she was okay. Kara told her that everything had turned out fine and Kara then asked what Lena wanted to talk about earlier. Lena told her that she had actually settled that on her own. Hanging up, Lena then looked over at Rhea, whom she had decided to work with on the portal after all. Lena then asked if they were ready to change the world which Rhea told her that she was.

Rhea's betrayal
Lena later has lunch with Kara, who asks what has kept her so busy. Lena tells her that she is working with a new partner before leaving to do their first test on the portal. Later, Lena and Rhea are at dinner discussing the failed first test of the portal. Lena is disappointed but Lillian reassures Lena that she believes in her. Once again, their tests fail and Lena suggests they go get Lex because he would be able to fix it. Lena continues to be frustrated at the lack of progress being made and says she wanted to get it working to prove to everyone, and herself that she was just as good as Lex. Rhea reassures Lena that she is smart and assures her that she can do it and gives her advice on how to get it to work, emphasizing that Lena was trying to solve the technical problem in a way that Lex would when the younger Luthor should be charting out her own course for a solution, and one separate from her brother’s usual methods. Taking Rhea’s advice to heart, Lena and everyone there watched with glee as the portal’s matter-transferral effect finally stabilizes.

When Rhea is next seen, she tauntingly dismisses a call from Kara; and when Lena asks her about it, Rhea lies, claiming that it was a telemarketer who just called. Lena later runs up to her and on this third scheduled test run to happen, the portal is being activated. Lena suddenly comes to realize that success means that Rhea will be leaving and is disappointed, having seen her as a mentor figure. Rhea tells her that no matter what, she cherished the time they spent together. Seconds after, Rhea powers the portal again, flummoxing Lena who demands what the former did and her son, J’onn and Supergirl crashed into the facility to stop her; Lena realizes that Rhea used her to get the now self-sustaining portal working and it is discovered that she was using the portal to bring something to earth. While Supergirl is fighting Rhea, Lena is knocked unconscious and later transported with Rhea and Mon-El to one of the Daxamite ships.

Lena wakes up to see Rhea sitting by her side. Rhea tries to convince her that Supergirl almost killed her but Lena knows that she was trying to stop Rhea and says that she should have been one to stop her. Lena is hurt that Rhea used her and betrayed her while Rhea tries to convince her that everything she said was true. Rhea calls Lena the best of her race amongst the wasted potential. Rhea calls Lena and Mon-El into the throne room and announces they are to be married and they are to produce an heir which Lena flat out refused though Mon-El informed her that only their genetic material is needed. Despite that, the two of them still refuse to be married which Rhea answers by threatening to kill thousands of people in hospitals, including the Luthor Family Children's Hospital. Blackmailed, both Lena and Mon-El reluctantly agree to Rhea's demands after that to avoid innocents suffering.

While the ceremony commences, with both Lena and Mon-El in appropriate attires, it is interrupted by Cat Grant, warning Rhea that she messed with the wrong people and encouraging the people of National City to defend themselves and not let them win. Lena and Mon-El are then ordered back to their holdings while Rhea tries to see to the refreshed resistance that is occurring in the city. Mon-El orders the guard to stand down as the Prince of Daxam, he struggles to take him out until Lena shoots him with his dropped gun and walks off with the prince.

When they come across a locked door, Lena orders Mon-El to break the glass and cleverly uses the tiara she is wearing to get it to open, where Mon-El tells Lena he realizes why Kara loves her and she responds with likewise. Getting through the door, they run into Supergirl, Lillian and Cyborg Hank Henshaw, through a platoon of felled Daxamite guards. Lena is shocked to see her mother having come to get her along with Supergirl and Lillian told her that she would do anything to save her. They then moved to leave through the portal and emerged in the Fortress of Solitude, however, she saw that only she, her mother and Henshaw had come while Supergirl and Mon-El weren't. Lillian then told her that she had rigged the portal to only allow humans to come back and not the aliens before she sent the call for Rhea's ship to be destroyed. Upon seeing that her mother betrayed and had left Supergirl and Mon-El on the ship to die, she realized that her mother hadn't changed. However, Supergirl and Winn had foreseen this move and had rigged an override in Hank Henshaw that made him re-start the portal and keep Lillian from interfering. When the portal was reactivated, Mon-El stepped through and told Lena that Supergirl chose to stay to confront his mother.

Lena found her way back to L-Corp where, whilst drinking away her guilt and sorrows, she moved to make a mess of the Luthor Family chess set in her office. Lillian then came in and asked her why she would let herself be duped by Rhea and Lena told her that it was because Rhea believed in her and had inspired her. She felt that with Rhea she gave her the encouragement that Lillian never gave her. Lillian relented that she wasn't the best mother, but now was the time that they needed to work together to stop Rhea and her army. She then revealed the device that Lena had seen her take from Lex's vault. She revealed that it was intended to be used on Kryptonians but, with Lena's help, it could be altered to be used against the Daxamites instead, seeing how Lena was able to convert what was originally L-Corp’s large-scale generator ring into a working transmatter portal (that brought Earth’s present state of overwhelming crisis from the invading Daxamites) with her brilliance. Lena then contacted the D.E.O. and told them that she and her mother had a weapon to turn the tide, but presumably requests that they first send the Kryptonians over at L-Corp to offer some outside opinion. She was then visited by Supergirl and Superman and she revealed that the device they had was built by Lex to dispense Kryptonite into the atmosphere in order to make the planet uninhabitable to Kryptonians. However, Lena was working to make it dispense lead instead so that it would force the Daxamites to leave. But, Lena knew that it would work on all Daxamites, including Mon-El. She then asked if Supergirl knew that Mon-El had been dating Kara Danvers, missing the look passing between her and Lillian. Rather than answering the question, Lena was instead ordered by Supergirl to begin with working with the device to set their plan into motion. Later, Winn (who was sent by J'onn to assist Lena in her office) and Lena are working on the device. Upon completion, Lillian grabs the device and activates it but, when it doesn't work, is told by Lena that she secretly gave Supergirl the remote, so that only the Kryptonian could activate it when she needs it. Thus, the three of them vigilantly stayed inside Lena’s office, and standing guard over the finished contraption, until it was finally triggered by Kara. After everything is over with the Daxamites’ forced retreat, it is discovered that Lillian took all the credit despite Lena and Winn being the ones to finalize the device.

Re-building National City
Following the months after the expunged Daxamite invasion, it was revealed that Lena has allocated her resources to have her company assist in any way it can for the rebuilding of all the damage left by the invaders, donating billions of dollars for the renovation and rebuilding of damage left in the Daxamites' wake. In that daunting venture, she reached out to Morgan Edge for aid, as the land and real estate developer's impeccable portfolio deemed Edge's development plans as her (and everyone else's) best shot in the restoration efforts for the ravaged National City. And true enough, within barely half a year, the collaborated reconstruction efforts (together with Supergirl and the mayor's permission) permitted the city infrastructure and economy to emerge stable and operational once more. However, overtime, Lena became aware of Morgan's egotistical sexism, about how he thinks little of other people's thoughts and opinions, especially if from the fairer sex; but Lena kept silent about hers concerning Edge, not wanting any friction to expand between the two of them. She however, like some of the city's one percenters, vocally disapproved when Edge furthers his notions of renewing National City by remaking its waterfront to his liking (and profitability). During these past six months of mass-scale renewals, Lena also attempted contact with Kara, who was suffering emotionally from the loss of Mon-El, setting up schedules and plans, but was turned down every time due to Kara dedicating her time and focus as Supergirl (drastically reducing crime despite the vulnerable and shattered state their city was in and assisting in its property renovations) which Lena wasn't aware of.

She was seen, along with other business representatives and negotiates, seated at a table conference in Morgan's office wherein he was basically over-praising himself and those who enabled him to conduct his projects for reviving the city back to its former glory. But Lena, along with James Olsen who was also seated there, was rather quick to point out that Supergirl had a hand in the restoration as well. Morgan then shifted the subject as to why his business proposition to renovate the waterfront as well has yet to be given clearance from the city officials; and again, both James and Lena responded with simultaneous controversy as such an undertaking would deprive the less-than-privileged of their homes for the benefit of the wealthy.

Morgan then proceeded to verbally target Lena, bringing up the fact that she was trying to absolve not only her family of their transgressions but also her own, since it was because of her that the Daxamites were able to descend upon National City in the first place. He stresses to her that guilt is not a particularly effective business strategem, with Lena coldly replying that neither was exploitation. Sensing that he may have gone too far and that it was almost lunch time, Morgan suggested everyone present there that they all adjourn to the office room next door, where his staff prepared a glorious buffet for Edge's business associates and guests. As the group rose up, Lena calls out to Morgan, telling him that he's not as influential or powerful as he'd like to believe himself as. Morgan arrogantly brushes this off, pointing out to her that powerful people, herself included, were in his office.

Lena was later visited by Kara in her office at L-Corp, bringing up Morgan Edge's intent to buy CatCo Worldwide Media, which was now up for sale as a result of Edge cunningly and subtly buying a series of its company shares, rallying up the editorial's shareholders behind him as support up to that point, and with Snapper Carr off to a Sabbatical and Cat Grant not being there (Cat now serves as the president's press secretary and had to put CatCo on a blind trust) to rebuke his impending takeover. Kara rather thinks Morgan's bid was intended to stop James from further using his editorial influence to downplaying Edge's future land development plans and about how he and Lena stood up against Morgan in his office from earlier; Lena did not put this past Morgan, whom she believes wasn't above spending that much money on a petty grudge. She nevertheless agrees with Kara that Morgan also taking control of CatCo would mean bad for those below the higher societal class since the real estate mogul would then be able to sway public opinions and supports to his favor, leaving his developmental projects unopposed in National City. Lena was then asked by her friend to try convincing Morgan Edge to lay off his purchasing CatCo.

Assuring Kara that she would try, Lena then tells the reporter she misses her. The two apparently have had very little contact with each other after the city's alien invasion. Lena thinks Kara was cold-shouldering her for her part in driving away the Daxamites with that lead dispersion device she modified from Lex's original design that also resulted in Mon-El having to be sent away from Earth to keep the planet's lead-infused atmosphere from killing the Daxamite prince. She tells Kara that she was there for her, as Kara was for her when Lena lost Jack, and wanted to apologize for her conduct. Kara replies that Lena did what she had to do; and that in the end, it was Supergirl's decision to activate the device and so Mon-El's fate was not on Lena's, but was then distracted by a crime in progress being reported from a tablet on Lena's desk. Excusing herself out the door, Lena suggests brunch later with the departing reporter, to which Kara wordlessly nods as she left, leaving Lena doubtful about to Kara's claim of not blaming her for the Daxamite's forced banishment.

She later visits Morgan Edge in his office. Morgan, who was playing office golf, took note of this and coyly expresses what people might say when they hear of Lena's recurring presence in his domain and she snidely tells him that his charms equate to a film starring Michael Douglas from the concluding decade of last century. Morgan found that flattering, but finds it unlikely that the Luthor would come all this way just for that and Lena extends his proposition of investing more capital to Edge's campaigns. Morgan immediately suspects that in return for the commission, Lena would want him to cease his bid in buying CatCo Magazine. Lena doesn't deny that and emphasizes that Morgan should just stick to what he's good at: overseeing the rebirth of National City, as there were still sectors that require renovating, and managing a media conglomerate at the same time could eat away at his time table. Morgan ignores this and mocks Lena by stating that no matter what she does, no matter how benevolent, people will still see her as one who bears a name that brought prominence and infamy to her known family, a Luthor; a belief that he intends to reinforce and then use to his personal advantage in turning the community against Lena via CatCo's editorial resources. Lena then realizes the twofold reason behind Morgan's attempt-in-progress to purchase CatCo: negating the biased reports that the people have been receiving about him and also using that same media outlet to deface his enemies in business, starting with Lena. Edge would only affirm this, attributing it as "good business". Disgusted, Lena saw herself out, missing Robert Dubois, who was hiding behind one of the pillars in Morgan's personal office.

Standing later behind the podium at the unveiling of the Girl Of Steel Statue by the waterfront, Lena gave a few witty and amiable words to the people who came there for the event in deference for their savior. But everyone's elation quickly turned to horror when a large tremor erupted somewhere by the waterfront, causing Lena and so many others to duck for cover. She soon witnessed as Supergirl arrived and stopped Dubois' attack and flew his submarine out of the water.

Kara later visits Lena again in the latter's office. After two of them pushing aside the absolved matter concerning the underwater assault at the waterfront, Lena tells Kara how she bought CatCo Magazine from under Morgan Edge, meaning she is now the official proprietor of both Cat Grant's company and L-Corp, sparing the former from Edge's reach much to Kara's delight. However, Lena became distraught when Kara tells her of her resignation from CatCo; she urges Kara to return to there for work, knowing very little about journalism in which Kara knows plenty. Lena adds that it's rare to work together with someone close to you, and Kara seems to consider this. And that was when Morgan Edge, evidently peeved for having been out-bought by L-Corp in his CatCo takeover, unceremoniously came by insulting Lena' sanity, forcing Kara to get in between the two capitalists. Edge continues to vocally threaten Lena, who tells him that he warrants getting himself tossed, by her security detail, out of her office with that attitude. This prompts Kara to take her leave. That left Morgan and Lena alone, with the former menacingly going on with his verbal harassment. Lena retorts by saying she couldn't care less. Supergirl unexpectedly descends on the balcony, greeting Lena and then asking if she was done with Edge. Lena confirms that she was and moves away from her business rival.

Later, after Kara looked on at photos of herself and Mon-El, she sent Lena a reply to her text to accept her offer to hang out together the next day, addressing her as boss. Lena sends back a heart-shaped emoji to Kara.

Heading CatCo
On her first day at CatCo Magazine, Lena arrives on her first day at the office through Cat Grant’s private elevator, which she was apparently unaware as to whom it was specifically reserved for. Upon arriving and surveying the work environment, she seemed uncertain of what to do next, having delved into a wholly new business enterprise of which is entirely foreign to her. She was warmly greeted by Eve Teschmacher, who seemed thrilled to meet her up-close and offers to get her anything on her Lena’s first day as her and Lena suggests that Tess utilizes the private elevator as it would be faster to traverse up and down the establishment that way. Eve shies away from the suggestion and explained that particular elevator was reserved for only for Miss Grant’s usage, or for whomsoever’s at the top of CatCo’s hierarchy — meaning that the Luthor definitely qualifies.

Lena refutes this, saying that anyone could now use the elevator at their discretion and not just her, much to Eve’s delight and Lena soon stumbles upon James Olsen who wanted to chaperone Lena around the office and amenities that day. But knowing that she also had a company to run in L-Corp, James advises her to segregate her now-divided time between both companies wisely; and Lena informs Olsen that it won’t be necessary, as she had already arranged and settled affairs at L-Corp in her stead, so she could roam free in CatCo, taking in all of its intricacies, without any hindrances from the former, much to Olsen’s surprise. They both get into his office (formerly Cat Grant’s) and Kara comes into the office room, welcoming Lena there as her new boss after the latter’s generous purchase and handing, in personal appreciation, the new company Head a customized planner on her first day. James tells her that the top management there has yet to adapt to recent changes in leadership as the result of Lena’s abrupt purchase; they have even yet to secure a personal office room for her. James subtly hints on Lena taking his, but Lena tells him he could keep it viewing such as irrelevant, since her experience in L-Corp has somewhat made her antsy in having a whole office room all to herself (she had no idea how Cat or James does it, cooped up in theirs with all those flat television screen monitors in broadcast, lining the wall behind them), and that she’d rather have an active running of the establishment by roaming about and supervising its branches, unconfined by desk space. Turning to Kara, Lena brings up that she has a lead at Morgan Edge’s accounting that she wants Kara to cover it, but an emergency call from the D.E.O. forced the newly-returned reporter to decline from the assignment.

She would later approach both Kara and James again, moving side-by-side from the elevator, after a conference meeting with some of CatCo’s top-brass staff that she informs them of and having apparently summoned for the former to confer there as well (and only to arrive late), though James was apparently unaware of the meeting until last minute and, quite frankly, was beginning to feel that she was trying to leach the office off of him much to his displeasure. Lena then starts telling Kara of what happened there in the meeting and how she would have wanted her there, but yet another D.E.O. urgent call caused the office subordinate to take her leave. Curious, Lena inquires James as to where Kara was headed and James responded somewhat curtly, asking in turn as to why he wasn’t part of the meeting, nor was he informed on it, as it took place in a work environment that he ran in Cat Grant's stead for over a year. Noticing that her ability to make decisions was being challenged by her senior, but one whom Lena knew she must not make an enemy of from the beginning of her starting days at CatCo, Lena and James tensely stared down at each other, giving waspish remarks before going on their way.

Seemingly grown weary of Kara’s constantly weaseling away from her, Lena goes to visit the former at her desk, mildly confronting Kara of her scuttling behavior but states that she understands why so. Kara thinks and worries that Lena finally worked out her secret as Supergirl, afraid that what Lillian predicted — of Lena hating her best friend for lying to her — has finally come true, but learns that Lena believes Kara hasn’t truly gotten over Mon-El’s necessary departure, which was causing her work performance to suffer, and ignorant to the fact that Kara recently had her hands full as Supergirl battling against a formidable meta-human Psi, who recently arrived in National City robbing its banks and easily defeating Supergirl at every turn of confrontation by using the Kryptonian’s worst fears against her, incapacitating the city’s heroine twice in a row now while the poetically-gloating super-powered criminal gets away clean with her stolen prize at both times.

Relieved that her apprehensions weren’t the case, Kara tries to let Lena down easy, standing up to her and saying that she intends to settle the matter with Mon-El in her own way, overlapping with work if she must, despite Lena stating that she was free to take a break from duty if that was what Kara needed. She then shifts to stern pragmatism and talked to Kara not as a friend, but as her employer declaring that she did not spend large sums to overtake Morgan’s attempt in owning CatCo on a whim; that she was a businesswoman at her core. One with expectations, not just in remuneration, from her fresh purchase and that, as CatCo’s newest owner, she cannot slack off of her duties there much less tolerate such conduct from the employees under her and not even from Kara, as that would be favoritism, tightening tension between the two close friends. Cornered, Kara promises to get Lena’s delegated task done. And with that, she thanked and left Kara to her thoughts, looking over her shoulder just enough to watch the CatCo reporter leave.

But Lena’s suppositions on Kara’s inner conflict would later prove to be (partially) correct after all, when Supergirl’s third confrontation with Psi revealed her deepest and darkest fear: having sent Mon-El from Earth’s lead-infused atmosphere in a pod, she has no idea what became of her beloved after his exile and that, having been sent off in a similar fashion by her own mother, Kara knows the feeling of being sent away by someone dear (a parent, and from a planet that was once home, no less, but was rejecting you in your final moments there) all too well, worrying that she may very well have sent the Daxamite to his death — never to be heard from again. Alex’s words of encouragement, of how Mon-El was safe wherever he is now just as Kara was when Alura loaded her into the pod that brought her to Earth and the premise that the two literally star-crossed lovers will eventually reunite because of that, finally enabled Supergirl to get over her own crippling fears and she bested Psi with her newfound courage.

Upon her return to CatCo, Kara searches for Lena, whom she finds overseeing the work progress of one the office workers there. She tentatively approaches the Luthor, admitting to what the latter surmised from earlier was true but just didn’t want to admit it in herself, and apologizing in regards of her job performance thus far as a reporter; that it was crass of Kara not giving Lena her due respect. Not merely as her new employer, but also her friend. But Lena understands Kara’s plight, having gone through the same with Jack. Lena jokes that the concept of friendship was also foreign territory for her since the Luthor family have minions in the place of legitimate friends, hence why she’s not particularly good at it. They laughed together and Lena suggests that she and Kara make amends with a hug though was hesitant at the same time, maintaining her stance against favoritism but gives in, and the two women wrapped each other together in their arms.

It was then that they were approached by the newly-promoted Samantha Arias, Lena’s new mouthpiece and privy in L-Corp, governing its activities and operations in Lena’s place, causing Lena and Kara to break off from their warm hug. Smiling, Lena introduces her to Kara and vice-versa, and her two acquaintances amicably shook hands. A fateful encounter, this triumvirate of powerful women (with some of them perhaps more powerful than even they themselves presently realize) are only blissfully aware of what now awaits them some time in the future from that point onwards.

Later that night, Lena was seen leaving the office with Eve. They came across James, who appeared to have gotten over his hard-shelled demeanor for and impression of Lena; the two higher-ups of CatCo briefly greeted and departed for the night.

Having friends
Lena, with Kara in tow, visited her old office in L-Corp to leave her signature on some documents there and Sam Arias conveys with them after her daughter's soccer game, followed by a trip to the ice cream parlor with Ruby’s team. With Lena congratulating Sam on her first success endeavor as L-Corp's CFO, Kara suggests they celebrate at her place that night. Sam showed her reservations, but Lena and Kara were insistent she joins them.

Later, in Kara's apartment, Lena, Kara, Sam, Alex and Maggie were all gathered, telling stories of their personal lives and their plans for the future, when Kara had to scoot when she heard the sound of fire-truck sirens, passing it off as the need to get some more ice cubes, that only Alex and Maggie were aware of the pretense.

Lena would later find Sam in the office again, with the latter tearfully lamenting that she was failing Ruby as a mother due to her obligations at L-Corp. Lena offers a few words of encouragement, saying that the love Sam gives to Ruby was more than enough to make up for the times when Sam fails to be at her daughter's side, or when she's not giving Ruby her fullest and undivided attention.

Lena, Kara and Alex would later arrive at Ruby's performance recital. Sam was surprised that Lena came, and Lena reminded her that Ruby was going to have a lot of cool Aunts.

A couple of days later, she and James discussed CatCo's statistics when Kara walked into the room and told them to watch what Morgan Edge was broadcasting. Lena did and learned that several children were rushed to Luthor Family Hospital, as they were all suffering from lead poisoning. She and Kara rushed to the hospital, where they found Sam already there, having brought one of Ruby’s lead-ailed classmates in. Lena angrily confronted Edge who stood by what he televised, and accused Lena of not minding the consequences to her own actions when she altered the lead bomb to drive away Rhea, along with her entire faction and species.

Upon being accused of inadvertently poisoning children via the lead bomb deployed during the Daxamite invasion, Lena temporarily stepped down from both L-Corp and CatCo Worldwide Media, despite Kara and Sam’s insistence that Lena’s re-designing of the bomb was what saved the city and that stepping down now could be taken as an act of admitting guilt, in order for the latter company to provide unbiased reporting during the investigation, in addition to maintaining L-Corp's integrity, lest both enterprises under Lena’s ownership be branded for profiteering — a notion that Jimmy did not disagree to. She later held a press conference outside to let the public know of her plans, despite she herself being unsure if the contraption she modified was indeed to blame, only to be shot upon by a mother of one of the affected children, though James (and Sam, as it would later be revealed) valiantly took a non-lethal hit for her.

Forced to take refuge in Sam's household, Len was gratified that her acting CEO was allowing her to stay but unsure if it was a wise choice, as she was basically a marked woman with all the angry parents practically out for her blood. Sam assures Lena that it was okay and letting her in her home was the least she could do when the latter came in her time of need with her daughter. She confidently adds that this was what friends do for each other. Lena then piercingly asks if Sam would still be so if Ruby (who just walked past them with arms laden with sheets and pillows) was one of the children that got sick from lead; Sam could only look back without a reply, before looking down and Lena sadly does likewise — Samantha’s wordless response was all it took for Lena to sadly understand how things could have come to between the two of them had the scenario she suggested indeed been the case.

Kara later visits the Arias household, finding Lena by the kitchen counter and in an uncharacteristic state of despair, apparently drinking herself non-stop in liquor and carelessly breaking a wine glass or two in this stupor. Sweeping away the glass shards off the counter and dropping the broken pieces to the trash bin, the Kryptonian tries to get her friend to pull herself together, in spite now knowing from a recent experimentation, conducted by Winn at the D.E.O., that Lena’s lead dispersion bomb was liable for the afflicted juveniles’ deteriorating condition by around 10%. Kara chose not to tell Lena this, only for the latter to claim that her friend was "terrible at hiding things"; of course, given her superheroine persona that Lena has not even vaguely begun to suspect, the former mutters she wasn't so sure of Lena's claim, which barely registered to the heavily inebriated Lena.

The reporter assures that she won't rest until Lena's name was cleared from the accusations, mirroring her adamant tenacity from back when Lena was accosted for providing Metallo with a second Kryptonite heart and the subsequent escape of Lillian Luthor; but at this point, the despondent Luthor tells her, not as her employer but as her friend, to cease having truly believed that she was indeed at fault for what the children were going through right now. She commends Kara for her insistent belief in believing there's inherent good in everyone, even for someone bearing the Luthor name, as that was what Lena loves most about the reporter, but goes on to say that in the real world, there was good as well as bad and that either can happen even without deliberate intent. Lena laments at having led her life as a pariah — first due to her access to her family’s immense wealth and then, of course, because of Lex’s activities against Superman which was what motivated her to be positively seen by others as her own person, in addition to restoring the Luthor family’s honor. But in the end, regardless of what she commits herself into, Lena will always amount to what the general masses perceive her as: the (half-)sibling of a megalomaniacal mass murderer and criminal mastermind. Except that Lex never went as far as to endanger the well-being of innocent human children for what he perceived was the greater good, even by accident, meaning she just sank the Luthor name down to a new definition of low — perhaps deeper than either Lex or Lillian before her ever had — as far as morality was concerned. Kara could only listen with growing sadness as the person before her, whom she came to know as one of the strongest women in her life, devolve into how Kara herself basically was in following the days and months when she lost Mon-El — coincidentally to the same doomsday contraption that was the source of Lena's complete loss of hope and juveniles suffering. Lena then tries to have Kara spare her efforts in proving her best friend's innocence, saying that "she was not worth it". She later lapses to sleep that night.

However, Kara stayed up all night for Sam to arrive as well and the two researched and worked together while Lena slept silently nearby on Sam’s living room couch. Sam tells Kara how she has never seen Lena this vulnerable before, despite having known her for a long time and Kara agrees that Lena was secretly “mush” inside in spite of the tough image she typically upholds herself as.

Lena's phone woke her up, a bit startled, but she answered. Kara's informed her that Lena was not to blame for the sick kids, and an exasperated Lena reminded Kara how she told her to just let things be. Kara quickly stated how the children were poisoned due to a chemical reaction in the pool rather than actual exposure to dispersed lead. Lena reacted when Kara mentioned the name Acre Lee, and Kara asked if she knew the name, to which Lena said she didn't. She then visited Morgan Edge in his office, confronted him about the fact that she was now aware of his ploy to discredit her by blaming the poisoned children on her re-designed device, when he was the one who orchestrated the whole incident having integrated Acre Lee Chemicals into his enterprise and thus rendering the chemical company’s resources available for Edge’s disposal. His plan all along was to smear Lena's good name while bringing up himself up in the public eye.

Morgan was unfazed of her allegations and Lena was coldly furious of the fact that her business rival would mindlessly endanger innocent kids in his vendetta over the vendetta itself, pulls out a gun. She stated that she knew the woman who shot at her at the press conference was right and that it was high time she lives up to her Luthor name. However, she was hit over the head by one of Morgan Edge's men. When she awoke, Lena found herself in a cargo plane loaded with the same chemical substance from Acre Lee. The plane was being controlled by Edge, and she realized his plan was to dump barrels of the substance into the water to infect more people in National City, and then direct the public’s blame to her device once more. She tried to contact the air-base for help, but Edge cut off the transmission. Fortunately, the D.E.O. detected the aircraft’s presence and caught wind of Lena’s interrupted transmission — with Kara being there to discern that it was Lena at the other end. The plane’s cargo door suddenly opened and, thinking quickly, Lena tried to prevent the cargo from being dropped into the water. She pinned the platform where the barrels were on to the plane’s inner cabin, which forced Morgan to have the pilot crash the plane.

Supergirl flew in and closed the cargo hatch all the way. She and Lena began to feel some turbulence, forcing Supergirl to attempt holding the aircraft up from the inside. She also shouted to Lena to strap in, but Lena was thrown loose when one of the wing engines of the plane blew. The plane, unable to withstand Supergirl's pressure, broke in half; with the chemical barrels in one end and Lena falling to the bottom of the other. Supergirl told Lena that she couldn't hold both sides, reflecting the time when Lena herself was forced to choose between Kara and Jack, and had to make the painfully heart-breaking choice of sacrificing the latter. With their time running out and nary a thought to the contrary, Lena insisted the alien heroine to save to chemicals over her, but Kara (who would have none of it) refused, despite the strained efforts that she was already exerting in literally holding the aircraft’s pieces together, and urged the former to climb up, making Lena realize what was at stake and the risks that the Kryptonian was willing to take in saving everyone in National City — Lena included. Thus, her life matters just as everyone else there. Regaining her confidence, Lena nodded and began climbing, before jumping to grab Supergirl's outstretched hand, sparing both Lena and the barrels.

She visited CatCo to check on James Olsen who was slowly but surely recuperating from his shoulder wound, and the two shared a moment alone together. Lena told James that anyone who took a bullet for her could call her by her first name, and James agreed to do so. He then told her that his friends called him "James" or "Jimmy". Lena nodded and told him goodnight, and called him Jimmy.

She was later seen at Sam’s house again, on the couch, and thanked both Sam and Kara for their collaborated efforts in acquitting her name (despite of Edge coming off clean at the end). Lena informed them that she never had anyone willing to love her no matter what, and Kara told her that it was because she never had a sister. Sam chimed in that Lena had two sisters now, and they both come together and hugged either side of Lena. After the truth was revealed, it is believed that Lena returned to her companies after L-Corp succeeded in synthesizing a cure for the lead-poisoned children.

A Grim Yule
Lena was seen, by the kitchen counter, in Kara’s apartment together with the latter’s inner circle of friends who gathered there in celebration for the Christmas holiday; she was drinking in friendly conversation together with James while everyone else around them readied for the season’s coming event. Sam and Ruby later arrived and Lena took note that the former seemed slightly pale and tired. Sam assures her that it was no issue and then proceeded to tease Lena on recent developments with her relationship with Olsen beyond work, to which Lena attempts to dance around the subject.

Overhearing them, Kara soon comes along and also noted her personal opinions on Jimmy and Lena’s burgeoning feelings for each other. Again, Lena tries to evade the topic and Kara expresses her gratification at celebrating that Christmas in her place together with Lena and Samantha — the two best gifts she attained that year — endearing both the latter two. Kara continues, saying that she has always appreciated being close to her sister Alex but never quite, outside of the Danvers family, had intimate best friends before either Sam or Lena came into her life and Kara in theirs. And it was because of their presence and relationship with her that the Kryptonian was able to pull through the approaching end of that year, in spite the layers upon layers of hardships and difficulties that she’s faced (and still facing), earning her an affectionate and comforting side-hug from Sam while Lena appreciatively looks on.

Lena was later seen discussing the matter of mysterious sigils appearing all across National City with James at CatCo; suspecting that this was yet another elaborate plot being instigated by Morgan Edge — due to the first and then now several of the sigils were left unceremoniously marking property owned under L-Corp — against Lena and her company, she and Olsen (who insisted to come along) decided to confront Edge in his office. Morgan, in his predisposed condescending and flippant demeanor, plainly claims that he had nothing to do about it and that his methods would be more direct, if that. Lena and James would later visit a site where they were to rendezvous with a contact of hers who could provide some information on Edge’s more discreet activities, in hopes of finding a lead that can connect Edge with those Kryptonian marks, with Jimmy himself expressing his doubts and worry as they could easily be ambushed while out in the open like this.

James’ apprehensions are later proven on the mark when he and Lena, while surveying a freshly-found and made Kryptonian mark, were fired upon from behind and afar by someone armed with a hi-tech armament, causing Olsen to usher Lena to safety as the gunman chased after them. And in that chase, Lena fell to the ground and was told to stay down until its safe, allowing Olsen to produce his Guardian Shield to deflect an ordnance fire without Lena seeing and proceeded to overpower their assailant, in time to retract his shield once again by the time Lena stood back up on her feet. She was none too flustered and jokes to him that it was merely the quarterly assassination attempt on her life as the year was about to end James, on the other hand, wonders their attacker was.

Returning to CatCo, James and Lena were ruminating over the assailant they delivered to the authorities. Apparently, the man refused to answer questions and was shielded from further interrogation under legal protection. Samantha came, having heard of what happened, and was worried for Lena. Her boss then showed some gathered intelligence on the assailant for Sam, affirming that the man had past connections with Edge and also had access to advanced weaponry and similar articles, such as the implement used when he went earlier after Olsen and Luthor. However, this only establishes a circumstantial link between the weapon and Edge himself. And in a silently ominous and seething tone, Sam notes that Edge should be dead; this dark and subtle change in behavior did not go unnoticed by Lena, who frowns slightly from Sam’s perceived reaction. James then drew Lena’s attention to the televised reports on the murders of the One-Seven gang that happened elsewhere on the same night the two of them were attacked, and neither noticing Sam wordlessly leaving the office.

They are later seen watching Morgan Edge, who narrowly survived an encounter with an unknown and murderous Kryptonian that went after him, in his own office, at his company’s Christmas party. Turning her back on the screen, Lena retreated into her office at CatCo with James at her heels, noting to him that he’s saved her life twice now and is grateful. She offers him a drink and Jimmy accepts. Then, giving in to desire, they began to kiss.

The two of them later rushed to the open streets, where the brutal battle between Reign and Supergirl had finally reached. Lena and James watched the breathtaking sight of the two powerful Kryptonians fight in shock (with Lena, of course, oblivious to the said pair of aliens actually being none other than her best friends, Sam and Kara, in disguise), and James then ushered the nearby civilians and bystanders away from the battling aliens with Lena following suit. Then, James and Lena looked increasingly aghast at the sight of National City’s heroine weakening before the might of her masked adversary, culminating to a severely battered Kara falling into the middle of a crater, defeated at last by Reign.

With James Olsen
Garbed in somewhat revealing business attire, two days later following Supergirl and Reign’s epic battle, Lena watches the televised news with Jimmy at her side at CatCo, showing how much the city’s criminal element sky-rocketed in the wake of Supergirl’s defeat; she expresses her concern, but James assures Lena that everything will be fine. Lena then brings up the matter concerning Kara — whom she acknowledges as the only journalist in the city with the knack for finding the alien heroine out of the blue — who has yet to turn up for work since Christmas and much less spotted in the wake of the Kryptonians’ skirmish that night.

And again, Jimmy tries to cover, albeit with a slight stammer as he couldn’t afford to let anything slip concerning Kara’s secret nor the fact that she was being treated from her loss, as Supergirl, at Reign’s hands. His gorgeous boss then turns the somewhat awkward subject of what was now going on between her and Olsen, and how Kara may regard that once she catches wind of Lena and James’ new and burgeoning relationship — aware of the short-lived one that was once between Jimmy and Kara, and that Lena was uncomfortable with the thought of withholding that knowledge from her best friend since keeping secrets from each other like this was one of the root causes why the Luthors have such an unscrupulous reputation, and not to mention the shattered state of the family from within. James could only agree but that was when CatCo received an unexpected visit from Reign herself, with a captured criminal, having flown all the way into the building, through a glass window, with the deviant literally at hand and throwing the unfortunate man down at everyone’s feet there, much to their shock.

With the entire office flocking cautiously around the infamous Kryptonian responsible for felling Supergirl not a fortnight ago, Lena demands Reign why she came and the alien (who was also secretly Lena’s L-Corp employee, Sam, unbeknownst to her employer and close friend) simply states her intent to send out a message through CatCo, much to Lena’s immediate protest. Amused, the disguised Sam would only reply, with a chilling smile at Lena’s defiance, that the latter’s people there will do so regardless. True enough, Reign addresses one of the cameramen there to use his camera in broadcasting her statement and proceeded to extend her message throughout National City — which was to expunge criminality in all of its forms present there, leaving only the righteous and with little regard to people’s humanitarian rights.

Personality
Despite being raised by Lillian; following Lionel's death, Lena is the opposite of her half-brother and step-mother; whereas they are delusional, egotistical, immoral and murderous, Lena is kind, caring, dutiful, selfless, moral and honorable. While proud of her family name, she is determined to return her company to its former good status and use it to help people. However, she is not above withholding crucial information from known allies if it meant the smooth proceeding of any plans she instigates but has thus far done in good conscience. In addition, she is quite intelligent, as she feigned allegiance to Lillian Luthor in order to destroy the Medusa virus, practically sensed at once (over a restaurant dinner) Rhea’s true alien nature and at age four, beat her older half-brother in chess upon being brought home by her father. Lena mentioned she is not fond of flying, even though it is statistically the safest way to travel, and later states to hate flyers and leaflets, claiming they waste both precious time and fine lumber.

A resourceful, honest and practical (but not overly consummate) entrepreneur and capitalist, Lena seems to admire those with strong resolve. This was shown when she accused Clark Kent of suspecting her based on her last name, as he did not back off and she responded by showing respect for his steel resolve. Nevertheless, Lena's strong moral compass prevents her from exhibiting that same level of appreciation towards those of less than honorable intent, as seen when she explicitly stated her repulsion to both Beth Breen and Morgan Edge after learning that they were unethically using their respective company resources for anything but noble ends which makes it safe to assume that she also discontinued or even terminated L-Corp's military contracts and channels, along with R&D on warfare technologies, that supplied eclectic clients with advanced armaments and ordnances, for that same notion as she no longer wanted her family’s company in any way associated with murder and world domination through pretentious businesses and unscrupulous contract deals, like war profiteering, from back during its LuthorCorp days when it was still under her brother's control; likewise, her firm morality was what irreparably broke Lena's otherwise strong rapport with Rhea despite of finding in the latter the sort of maternal affection — denied of such by her foster-mother, Lillian, from the point of childhood — that Lena craved for a significant portion of her life. She is also perceptive enough to know that Kara was actually trying to milk from her intel concerning Lilian and then later on Biomax when she and "Mike" unexpectedly inserted themselves into Lena and Jack's date. But interestingly, she has a monumental blind-spot towards people close to her life that inhibits Lena’s ability to discern deeper into such individuals beyond the realms of simple acquaintance, seemingly until it’s too late — such as the lines of what both her adoptive mother and half-brother are willing to cross for their murderous self-interests, followed later by Rhea’s and, of course, her continued ignorance that now not just one but two of her dearest friends and “sisters” (i.e. Kara and Samantha) are, in fact, super-powered aliens.

During times of distress, or anything detrimental and either in or out of capitalism, Lena often exhibits, for as long as it isn't personal, the ability to remain oddly calm and perhaps even coldly calculating, allowing her to commit necessary acts with evident conviction and pragmatism, as seen when she shot Corben from behind while the latter was restraining Alex; she later repeated the act by shooting a Daxamite guard whom Mon-El was fighting against with the guard's very weapon, which Lena quite reservedly retrieved from where it fell to use on their captor. She did, however, showed some internal conflict when she set out to thwart Lillian's Medusa Virus plot, followed by reluctance to answer calls from Lillian whilst the latter was on trial (only deciding to respond and visit her in prison after Kara advised her so) and when it was revealed that her mother broke her out of incarceration (since Lena was in prison herself then) so she could use Lena to bypass the genetic lock securing Lex's weapons vault, had to condemn Jack to death in order to save Kara (as Supergirl) from the Biomax swarm and later distrusted Rhea (despite developing a mother-daughter like bond) when she realized the Daxamite queen used her orchestrate the invasion of Planet Earth by her scattered species.

Lena is disgusted by the horrible acts committed by her half-brother and step-mother respectively, as she makes no attempt to defend her half-brother, Lex Luthor for his crimes, and doesn't blame Superman for his imprisonment, as she knows full well that the latter brought it on himself, but did attempt to reach out to Lex and reprimanded him; she was even disgusted by her step-mother, Lillian for her attempt to wipe out all alien life on Earth, as Lena had no qualms about turning her step-mother over to the authorities for her crimes. The reason why she never had a good relationship with Lillian, partly due to her step-mother always favored Lex over her and mainly because Lillian has always been cold to Lena, because she is a living reminder of Lionel's affair. But in spite of her presented family’s somewhat more questionable conducts, Lena's experience from childhood to early adulthood under their care and nurturing led to her becoming proud to be their ward, harboring a rare degree of respect for the family name uncommon to those outside of, or even remotely close, to the said family. In fact, this reverence to her foster name as a Luthor serves as one of Lena’s primary and staunch motivations in committing herself to absolving the Luthor name after Lex besmirched it considerably in his campaign against Superman, such that she once reacted defensively when Supergirl revealed to her that Lillian was the head of Cadmus, despite the Girl of Steel having just saved Lena from Henshaw's assault (though given how Lena thwarted Lillian’s release of Medusa later on, it was unknown if it had all been an act from the moment Kara, as Supergirl, informed Lena of Lillian's directives in leading Cadmus) and then again with Rhea when Lena realized that the Daxamite Queen withheld some details concerning her alien identity, out of caution because of Lena's adoptive family.

Despite her estranged relationships with her half-brother and step-mother, Lena at least had a good relationship with her father, Lionel Luthor (prior to his death) as he was always loving towards her and treated her warmly, Lena held her father in high esteem, so much that she became angry when her step-mother spoke ill of him, although she did not know Lionel was her biological father until she was an adult and years after her father passed away, after finding out that Lionel was her biological father, Lena showed no signs of anger or bitterness that he never told her the truth about their relationship. She initially also adored Lex, saying that her older step-brother (later confirmed to be Lena’s paternal half-brother) made her feel most accepted into the Luthor household, and proud to bear their family's name, from the time when she was but a total stranger brought in by Lionel into his home after Lena's mother died. This amicable relationship between the siblings turned sour as they reached maturity, with Lex gradually becoming power-mad and obsessed with destroying Superman; Lena repeatedly tried and failed in getting her brother to see reason, but to no avail.

The first-born Luthor's madness and irrationality progressed to the point that, as of adulthood and after being convicted with around three dozen consecutive sentences, Lex would orchestrate Lena's assassination from inside his containment in maximum security, using his global connections to hire John Corben for the deed, after hearing of his sister's declaration to rename LuthorCorp into L-Corp as the first step in purifying it from her brother's legacy and also to stand out on her own. At that point, upon realizing that Lex was willing to put a hit on her in order to preserve the Luthor Family legacy and his place in it, any sibling love between him and Lena became a thing in the past when the latter learned how far Lex would go to make ends meet. With the assassination attempt on her life thwarted thanks to the intervention of Supergirl and the D.E.O. Lena hopes that her brother will not be able to repeat another such attempt, borderline confident that no other hitman would accept from Lex the job of targeting her, seeing that she was the one who personally shot the last assassin Lex sent after her, and relishes at the thought of Lex being mocked behind bars, by the prison guards and the inmates he was incarcerated together with, for his failure; and the fragile cordiality aside, Lena's worst but long-standing and (sadly) still active relationship within her family was no doubt with Lillian, who claims to have loved Lena, as much as Lex, in Lillian's own subtle way but also acknowledges that her son was her favorite (as Lena was Lionel’s) and kindly stating to Lena that no parent loves their children equally as a whole. In spite of that, Lillian has been known to visit Lena at L-Corp from time to time, trying to establish some even ground between herself and her adopted daughter. When Lillian learned that Lena unexpectedly became friends with Supergirl, catching the latter two together once in Lena's office, her (twisted) protective motherly instincts kicked in; she saw the surprising friendship developing between Lena and Kara's alter-ego as no different to what was once between her son Lex and Superman — wherein one will eventually be reneged on and doomed by the other. Having already lost one child due to the Kryptonians, Lillian sets out to further enact Cadmus’ future plans in her perceived attempt to "save" Lena. Kidnapping Kara after Mon-El, Lillian made it very clear to the former that she did not want her anywhere near Lena, proceeding to threaten and put the two captive aliens under duress, culminating in Cadmus gaining access to the Medusa Virus. Luckily, Lena did not share her foster mother's anti-alien sentiments and enacted her own plan to save the aliens of National City from the Krypton-based pathogen, soon after Supergirl informed Lena of Lillian's plot, and called the authorities on Lillian at the end.

The fact that Lena could just shamelessly insert herself into Lillian's organization and then ultimately backstab her whilst within shows how little mother-daughter affection exists between the two of them (which will later contribute in Lena becoming very accepting towards Rhea over her better judgement); though it did not prevent the former from feeling some guilt at betraying Lillian the way she did, despite knowing that she did the right thing, such that it took some friendly advice from Kara before Lena visited Lillian in prison. Shortly after Metallo and Lillian's escape, the latter has Cyborg Superman successfully frame Lena for providing Metallo with the synthetic Kryptonite that energized him for the escape, getting Lena arrested by the NCPD and then later had her broken out by the empowered Corben. Sitting together in their getaway vehicle, Lillian tried to explain to her daughter that everything happening thus far was her way of showing a mother's love to Lena; and that getting through the biometric lock, accessible only by a Luthor such as Lena by means of her handprint, to Lex's weapons vault was an added bonus.

Ironically, this did not stop Lillian from leaving Lena at Lex's hideout just when Corben's Kryptonite heart was about to go critical (though she may not have been aware, choosing instead to disbelieve Supergirl's warnings). Later when Cadmus agents set out to abduct every alien whose identities were on the D.E.O.'s alien registry, Lillian sent some henchman to forcibly stop Lena's investigation on the ties between Lillian and LuthorCorp, as such connections could lead to where the Cadmus-abducted aliens were being kept and thereby derail what the organization has in mind for them. However, while Lillian had in mind to halt Lena's progress, she showed restraint by specifically instructing her subordinates to not harm their target.

Lena would later be shocked at seeing Lillian working together with the D.E.O. to rescue both her and Mon-El from within Rhea's flagship; only to be disappointed when Lillian had Henshaw lock down the portal after the three of them went through, trapping the Daxamite prince and his Kryptonian girlfriend aboard the said vessel. Though grateful at being saved from the force marriage, Lena was furious at her mother for arranging to have the former’s alien allies left behind, realizing that this was what Lillian planned all along. Lillian defends her actions, insisting that Supergirl and Mon-El were still aliens, and the eradication of non-human sapient species from Earth was her organization's priority goal. Lillian would later admit that her hatred for extra-terrestrials overshadows her love for Lena, and then offers to renew their relationship by first driving away the Daxamites using a contraption that the Lillian retrieved from Lex's arsenal.

Mellowing down, she states to Lena that with the Daxamites invading, Lex had the right mind to lead first into the offensive when he targeted Superman, but perhaps Lillian has supported the wrong child with Cadmus behind her and then offers to Lena the possibility of correcting her mistake of bringing the Daxamites to Earth by also becoming the one to cause them to flee from the planet; the device she brought to Lena was originally designed to force Kryptonians into leaving Earth. But given how Lena could get a large-scale transmatter portal working for the use of an entire invading alien armada, Lillian believes that Lena could alter the device so it would target the Daxamites instead. Though succeeding in that venture, Lillian would take credit with no mention of Lena to the public until later. It should be noted that though Lillian had unshakeable faith in Lena's success, it was possible that she was just using her daughter (yet again) for something that Lillian could not achieve even with Cadmus at her side as she was quick to deploy the anti-Daxamite weapon after Winn and Lena completed it, only to be smugly told by her daughter that it was assembled and arranged so only Supergirl would have the means to activate it when the need arises, since the Kryptonian was engaged in a trial of combat with Rhea to determine the fate of Earth and humanity at that time.

Lena has proved to be very different from her family, however other individuals, such as Winn Schott, Eliza Danvers and James Olsen (incorrectly) believe that she is secretly like any other Luthor and Lena herself does worry, especially after learning of her true biological relation to Lex, that she may become like him and Lillian one day. And on the part of her adoptive mother, Lillian, in spite of the emotional distance between the two of them, rather thinks that Lena shows promise to make her proud as Lionel's true-blooded daughter, when Lena finally joins Cadmus in Lex and Lillian's bid to purge their world of Kryptonians and all manner of extra-terrestrial life staying therein, believing that Lena does hold that kind of darkness within her but has yet to give in; it is for that reason why Lillian determinedly refuses to let her adopted daughter know of the fact that Supergirl and Kara Danvers were the same person — invested in the belief that, factoring Lena's intelligence, she would discern Kara's secret eventually and will despise the Kryptonian for the in-plain-sight deception, trusting that the resulting fallout between Kara and Lena would be the right catalyst in turning the latter to Lillian's cause for good. Lena showed her sympathetic and compassionate side when Sam was reduced to tears, thinking that her new role as Lena's acting CEO, in addition as L-Corp's CFO, was gradually causing her to miss out on her responsibilities as Ruby's mother; Lena kindly took note of this with a heart-to-heart and puts Sam's predicament into perspective by bringing up that she knows something about "worst mothers" and that Sam was nothing like Lena's own, who barely extended to Lena what was passable as "motherly love", because even though Sam couldn't be around her own daughter all the time, her affection for Ruby during their times together more than compensates for it.

However, Lena is also sometimes emotionally vulnerable (or "mush", as Sam calls it) that, though affable and open to others in her own way, Lena's imposing family background and exploited channels of widespread connections has led her to become somewhat guarded to outsiders - which may even extend to those whose respect that Lena earned and them in reciprocation with hers, such as her business employees and associates, who likes her in turn if not for the professionalism of it. She even claims herself, before moving on to National City in taking over the family company and later Cat Grant's, as entirely stranger to the concept of friendship because of the Luthors' high standards when it comes to socializing outside of the family (which normally involves hiring a private investigator to profile and provide intensive and extensive information concerning said outsiders) and coming to National City was the turning point that turned Lena's underlying, segregated lifestyle for the better. But unlike the rest of her family, she seems veritably able to give strangers the benefit of a doubt to permit them into personally getting to know Lena and vice-versa, and that was what led to both Samantha and Kara (both non-humans, without Lena knowing better, and also both of a handful from whom Lena would probably and plainly listen to in regards to outside perspective and advisory capacity) into Lena's inner circle of close relationships; not to mention Jack Spheer, whom she fell in love with before moving on from where he was at Metropolis (and to whom Lena nursed an aching spot ever since they're breakup that she'd repeatedly sought Kara’s side-by-side support or friendly advise not long after Lena heard that Jack arrived in National City to showcase his latest medical breakthrough, with the possibility of reconciliation with Lena once all was said and done), and now James Olsen who, because of his past brushes with Lex, started out very defensive (and some would say even distrustful) in her presence and disposition even before Lena bought CatCo — officially making her everyone's superior there, Olsen included.

This trait of sometimes being unsure of or lacking confidence in herself, despite of Lena's achieved accomplishments, proved itself a weakness that Rhea exploited in order to get the portal constructed and completed. She becomes a mentor and almost a mother-figure to Lena by giving her pep talks, reassuring her that she is intelligent, that she can repair the portal, and that she believes in her. It is clear that Lena craves a mother-like relationship that she did not get from her step-mother Lillian. Lena has also shown being able to accept due guilt should there even be a slightest hint of her own hand in its making and will try to alleviate those affected in any way she can, such as donating sizeable sums to effect repairs on National City and when she meekly attempted several times to hang out with and provide solace to Kara in the time following the countered Daxamite invasion, rightly believing that the reporter was devastated by Mon-El's exile (so much that the Kryptonian immersed herself in serving the city as her heroic alter-ego to suppress her emotional pain), brought about by the piece of anti-alien tech that Lena herself deviated and entrusted to Supergirl and the D.E.O’s disposal, and when Morgan Edge succeeded in vilifying Lena for accidentally poisoning a good percentage of National City’s juveniles with lead from the anti-Daxamite bomb she rigged, Lena practically made no attempt to defend her actions in setting up the device, nor to re-direct the blame elsewhere (i.e. Supergirl, who ultimately made the decision to trigger the device against the Daxamites after Lena readied it for usage), and instead publicly announced her decision to step down from both CatCo and L-Corp so to uphold both companies’ dignity for the community. She would later be seen moping in a hopeless state, with none of the usual air of reserved self-confidence that Lena generally maintains, instead drunk and close to breaking down in tears after erroneously coming to the conclusion that all those children becoming afflicted were indeed on her account.

After Kara and Sam brought up to Lena that this wasn't the case, Lena went after Edge in his own office, armed with a gun and showing a truly reckless side of herself that was willing to ignore the typical constraints of morality and ethics if pushed to her moral limits for at that point, Lena was on her last straw such that she found justifiable what she intended to do upon Morgan under the premise of finally embracing the darker aspects of her foster family’s name. It took an airborne rescue from Supergirl and the two of them working together to stop another wave of lead-based outbreak to get Lena’s confidence and composure back on track.

Abilities

 * Expert engineer: Lena was able to construct a portable black body field generator that effectively disabled the Cadmus-supplied alien weaponry that Miner's gang used; though she needed finalizing assistance from Winn to render the device functional, since Lena was not certain if the pulse to be generated by the device would be appropriate to counter the extra-terrestrial armaments without seeing the weapons in person herself, hence the trap she sprang to lure Chet Miner's gang to her charity gala, indicating that her technological aptitude is far from absolute. Still, she was nonetheless praised by Winn for her ingenuity; the D.E.O. had thought up of a similar approach, as Alex stated earlier to Maggie, but was enacted ahead by Lena showing that her technical expertise was not limited to mere state-of-the-art human technology. And yet even Lena herself admits that, in the progressive wake of her taking over her brother’s company and renaming it into L-Corp, Lex still outshines her in some aspects of brilliance. She would later head the successful large-scale construction of a Transmatter portal on Earth (though she was unaware that it was also drastically affecting Phorians on Earth, briefly causing the typically benign psychic species to react violently and lash out with their telekinetic powers), with a few helpful tips from Rhea, that allowed the Daxamites to invade the planet. Perhaps her greatest engineering feat yet was when she re-purposed (once again, with Winn's help) the device originally made by her brother to imbue Earth's atmosphere with Kryptonite — against Kryptonians — into dispersing lead instead, complete with a remote controller that she entrusted to Supergirl, which drove away the Daxamite invaders.
 * Expert programmer: Lena was able to override the Biomax nanobot swarm, after accessing Spheerical Industries mainframe from Jack's lab, in time to save Kara from being consumed by the said swarm. This hints great aptitude in the field of computer programming, possibly on par with Winn’s and Earth-1’s Felicity Smoak's, having spent years with Jack trying to perfect the nanobots' operational programs to guide their functions and coming pretty close to solving it together had the two of them not broke up and parted ways.
 * Genius-level intellect/Great business acumen/Expert tactician/Leader: Lena is highly intelligent, able to often beat her prodigious older half-brother in chess in her toddler years. Later as an adult, her intelligence was proven enough to CEO of L-Corp, overseeing it's daily activities and seeing to its successful rebirth as a legitimately legal multibillion-dollar corporation, ensuring that it would stay operational up to at least four centuries later on, as well as re-branding it as a force of good , and Rhea, the matriarch of an incredibly advanced alien civilization, would ultimately address Lena as an outstanding example of the human race not long after meeting her that she’d want to have her own son Mon-El father a child through Lena (and not necessarily through coital procreation). She devised a wily trap for Chet Miner's criminal gang with Supergirl close at hand, for the "clean-up", should anything go wrong , clever enough to deceive Lillian Luthor feigning an allegiance to her in order to destroy their plot with the Medusa virus , astutely deduced where all the kidnapped National City-registered extra-terrestrials were being held and later quickly thought up an effective strategy wherein she and Supergirl, side-by-side, took on both Beth Breen and the Biomax nanoswarm that Beth controls. By the time of her late teens, Lena was already well-versed in nanotechnology and nano-robotics, working with Jack Spheer for the pre-cursor of Biomax. During her and Mon-El's escape from their guards aboard the Daxamite flagship, Lena was able to bypass a technologically-advanced alien security system's lock using a simple (but priceless) tiara, given to her for the forced wedding, as a makeshift lock-pick, practically deducing with a glance how the mechanism works. And not long after purchasing CatCo, Lena would assign Samantha Arias as her acting CEO at L-Corp with the latter certainly proving herself capable of taking on the company challenges and satisfying Lena's expectations of her whilst working there at her stead, showing considerable aptitude in organizing, and handpicking from her present employees those most suited for the tasks delegated to them, on the part of Lena with Lena herself proving easily adaptable towards her new obligations at her overseeing of CatCo.
 * Skilled hand-to-hand combatant: Though mostly "unpolished", Lena has shown some aptitude in unarmed fighting when she traded blows with Beth Breen, a self-proclaimed black belt, and was resilient enough to take one of Beth's kicks to the gut before retaliating herself and knocking Beth down twice.
 * Skilled markswoman/Firearms: Lena is quite proficient in the use of firearms, human-made or otherwise, as she proves by gunning down John Corben and later a Daxamite with the latter's own weapon.

Supergirl
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Season 3
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Trivia

 * This version of Lena Luthor is (initially) legally Lex's adoptive sister, instead of his biological sister. However, it was later revealed that Lena does have biological ties to Lex by being his paternal half-sister. This is the second instance the two siblings appear to share only one parent, with the first one being the TV show, Smallville, though on which Lena (Tess Mercer) is never adopted by the Luthors.
 * Lena is 24 years old and thus at least a couple of years younger than Kara on the physical level; but chronologically, the latter is much older taking into account her stymied aging during her stay in the Phantom Zone.

Behind the scenes

 * Lena Luthor first appeared in Superman's Girlfriend, Lois Lane #23 (February 1961) and was created by Jerry Siegel and Kurt Schaffenberger. She usually appears as Lex Luthor's younger, and in some versions estranged or foster, sister.
 * Not to be confused with the character of the same name, who is Lex's daughter with his eighth or ninth wife and is named after her aunt, the original Lena.
 * Supergirl marks Lena's third live action television appearance; previously appearing in Superboy, and most notably, Smallville (although in Smallville the character was initially introduced under the name Tess Mercer in the show's eighth season, with her true identity not being revealed until the tenth season as Lutessa Lena Luthor).