- "So, I swear this began with me offering water and Band-Aids, and the next thing you know, I'm the Meredith Grey of Sherwood Forest. I'm sorry if stealing from my med school makes me a bad person."
- "It doesn't. It actually makes you deeper than I thought."
- —Mary Hamilton and Kate Kane[src]
Mary Hamilton (born May 17, 1995) is a medical student at Gotham University and influencer-in-the-making who secretly runs an illegal clinic to help Gotham's impoverished communities. She is the daughter of the late Catherine Hamilton-Kane, the step-daughter of Jacob Kane, and the step-sister of Kate Kane. Mary acted as a close ally and source of medical support to Batwoman since the beginning of the latter's vigilante activities. After revealing to Kate that she'd figured out her secret identity, Mary officially became a member of the Bat Team.
On May 25, 2004, Catherine married Jacob Kane and nine-years-old Mary met her new five years older step-sister, Kate Kane. Being quite different from one another, the two never really managed to become close, despite Mary's best efforts at being friendly. Nonetheless, she was very close with her stepfather, who loved Mary like his own daughter. Also, in spite of her usual tough facade, Kate herself has often shown to having grown fond and actually love Mary, who looked up to her through all her life.
In 2011, after Mary turned 16, Kate taught her how to drive despite not having a driving license herself, once charming the cops into not giving them a ticket after their car was pulled over. During her high school years, Mary attended Gotham Prep and, at the homecoming, she was ditched by Derrick Peters, thus Kate hunted him down and locked him into a urinal to avenge her step-sister.
Growing up, Mary became very active on social media, to the point of being considered sort of an influencer, much to her mother's dismay.
Sometime after graduating college, Mary enrolled in Gotham University as a medical student. Mary claimed it was only so she could find her "future husband", who she wanted to be a rich doctor. In actuality though, Mary was very interested in medicine and secretly became an excellent student. At Gotham University, Mary attended three classes taught by Dr. Ethan Campbell, while a friend of hers followed Professor John Carr's cryptography courses.
At some point before 2018, Mary started to distribute water and Band-Aids to residents of the poor neighborhood of Bennett Ave.. Sympathetic towards the people's plight, Mary secretly began using her medical expertise and Gotham University's funds to open an illegal clinic in the area.
The kidnapping of Sophie Moore
In late 2018, Mary attended the switching off of the Bat-Signal with her mother, Catherine. After Sophie Moore was kidnapped at the event, Mary called her step-sister, Kate, to come home. Mary organized a surprise welcome-home party for Kate, during which Mary talked her head off. Kate asked why she called her, and Mary revealed that she accidentally discovered a box of pictures of her relationship with Sophie, and thought that she would want to be in Gotham for her. Mary was pulled away by her mother to take a photo with a councilwoman.
The following day, Mary was working at her clinic when Kate was left on the doorstep. She was brought in and Mary helped stitch up a wound on her arm, when she explained all about the clinic, while also tending to an old man. Later a member of the Wonderland gang was brought into her clinic, and has somehow confessed Sophie's location.
Nearly killed by Alice
The following day, during breakfast, as her mother spoke about business at the phone, Mary watched a video of a baby turtle eating strawberry and showed it to an annoyed Kate. Then, after Jacob asked Kate if she wanted to reconsider the idea of joining the Crows and she dismissed it again, Mary asked if it was due to Sophie, saying she was shocked that she was now married to a man and asking out loud what was her actual sexual orientation, being cut out by Kate, who reveal to Jacob her suspicious that Alice was actually Beth, shocking everyone.
Later that day, Kate visited Mary's clinic in order to speak with one of Alice's goons she knew was brought there the previous night, and gave him a coded message to deliver to his boss. Then, after the goon was gone, Mary asked Kate if she wanted to have dinner with her, since they hadn't been able to spend time together after she came back. Kate accepted her invitation and they agreed to meet that evening out of the clinic.
Mary waited a long time but, at the time of the appointment Kate did not show up (being at a secret meeting at Burnside Park with Alice) however, after a brief blackout in the building, Chuck Dodgson appeared and attacked her with the intent of murder her on Alice's orders as she was jealous of her role as Kate's "new sister". Mary managed to defend herself by injuring Dodgson in the leg with a scalpel and locking herself in a closet, then was saved by Batwoman.
The following morning Kate visited Mary's clinic in order to apologize, however as she entered, Mary, still traumatized for the previous night pointed a gun to her then, after calming down, she scolded her for having ditched her, explaining the reason why Alice had her attacked, claiming to find it ironic, as she felt Kate didn't consider her a sister at all. Kate replied that it wasn't true but Mary didn't want to listen to her and instead asked her if it was worth it and to let Alice know that "she wasn't a threat", before to walk away in anger.
After the incident, Mary spent several nights working late at her clinic and, one morning, after having vaccinated a kid and rewarding her with a sweet for not having cried after the sting, she came back to the Kane penthouse pretending she spent the whole night partying, however she was confronted by Sophie, who informed that she asked her father to be assigned to her protection due to the girl having became Alice's target.
Much to Mary's dismay and embarrassment, Sophie started to follow her the whole day, even during her classes at Gotham University, prompting her to stated that she couldn't find her "future husband" if she kept following her around, then asking of her own marriage; Sophie avoided answering by asking instead about Kate and why she continued to refuse to join the Crows, to which Mary replied that it was because Sophie is one of them.
That night at Tommy Elliot's party, finding Mary and Sophie together in the elevator she was entered, Kate asked what was happening to which her step-sister complained about having a "baby-sitter", she and Kate mutually commented between one another how annoying Sophie was, then the elevator began a long climb dominated by an embarrassed silence.Later at the party, Mary complained to her mother about giving her a bodyguard, but she replied it was inevitable as they lived in difficult times; few moments later, having received a phone call from Alice (who was at their house) Jacob panicked and ordered his men to escort his family away, however due to Tommy having planted bombs on three elevators, Mary found herself stuck in one of it alongside Sophie and her husband, watching them bickering about Sophie not having told him she knew Kate when they were at Point Rock Academy, before they managed to escape and get her out of it.
On their way out of Elliot Tower, Mary and Sophie run in some people wounded by the explosion of the first elevator and she managed at first sight to locate a woman who wasn't adequately rescued, making a correct diagnosis of her condition and saving her life under the astonished gaze of a paramedic and the same Sophie.
After Dodgson developed an infection due to his days of captivity at the hand of Batwoman, she brought him to Mary's clinic asking her to deal with his wound with the maximum discretion. Mary, declaring to be a "big fan" of the vigilante reluctantly accepted despite the man having attempted to kill her.That evening, while he was handcuffed to the bed and drugged with morphine, Dodgson began hallucinating, calling for his boss and lover Alice. Hearing that, Mary decided to impersonate Alice in an attempt to extorting him part of the latter's villainous plan and prompting him to reveal her that a key component to it was a mysterious figure named "Mouse". Later, Batwoman came back to the clinic asking Mary for Dodgson conditions and she claimed he was stable, also referring her what she had discovered regarding Alice's intentions, which prompted Batwoman to plant a subdermal transmitter on Dodgson in order to track him after he returned to Alice, while complimenting Mary for her work.
The next day, during a walk by the river with her mother, Catherine revealed to Mary that years ago she made Jacob believe that Beth was dead by making pass deer bone fragments for Beth's and paying the coroner to manipulate the DNA test, so that he and Kate would move on. Mary was deeply unsettled by her mother's statement, deeming it as an "horrible thing", and walked away from her in a state of shock.
Distressed, Mary got completely drunk and stormed into the Wayne Tower demanding to speak with her step-sister, being then taken under the custody of the building concierge and escorted to the head of security, Luke Fox who introduced to her as Kate's assistant explaining she was not there and that he can deliver a message to her if needed, to which Mary began a confusing explanation of which Luke understood only that her mother may or may not have killed a deer, prompting the girl to explain everything from the beginning.
Mary spent the whole day at Wayne Tower complaining to Luke about being the daughter of the "Wicked Witch of Gotham". Upon realized that Alice was actually Beth as Kate had always believed, she asked Luke if Kate was with her, which he confirmed it. Mary bitterly lashed out at Luke how Kate still favored a serial killer to the former despite all her best effort to be a good sister.
After a while, still drunken due to the alcoholic beverages kept in Bruce's office, she watched the researches Luke was doing about Arkham Asylum outbreak, discovering the authorities have covered up everything about it, then she noticed the footage about Alice being the Skin Pirate and get hungry of pizza. That evening, after ordering and eating a pizza box, Mary apologized to Luke for disturbing him all day and left the building, asking him to simply tell Kate that she was sorry.
Few nights later, after Sophie was wounded in a gunfire at 200 of Rucka Avenue, Batwoman brought her to Mary's clinic asking her to take care of her and prevent her from leaving the facility. Despite her skepticism she obeyed and nursed the woman back to health; after Sophie woke up she asked were she was, to which Mary revealed the truth about her illegal clinic then, noticing she was handcuffed, Sophie asked to be released and Mary replied it was due to Batwoman's order. Frustrated, Sophie stated that the reason why Batwoman didn't want her to leave was that she knew her real identity, however Mary replied that she had no interest in that knowledge.
Later, Sophie managed to free herself and was about to leave the clinic being intercepted by Mary, who gave her some medical advises and a box of ibuprofen, urging her not to reveal to her step-father about her clinic nor Batwoman's identity due to betray people was kinda becoming "her thing" and she shouldn't hurt Batwoman the way she hurt Kate several years ago.
Then, after Batwoman came to visit her, asking about Sophie, Mary explained she had let her go despite the fact she probably knew her identity and would reveal it to the Crows' commander. Despite she expected the vigilante to be angered, she was surprised when Batwoman thanked her for saving Sophie and quietly left.
After Jacob asked to divorce from Catherine, Mary reluctantly accompanied her mother to see the lawyers; while they were on limousine she stated that she had yet to forgive her and wished to be everywhere but there with her, Catherine said that she would have understood her action after becoming a mother as well, then she was called by Hamilton Dynamics and informed of their secret weapon's disappearance as well as Dean Deveraux's death.
Later that night, Mary introduced into the Wayne Tower once again thanks to the help of her friend Carl the receptionist, to whom she offered a Frappuccino. After reaching Bruce's former office in order to speak to Kate, she waved at Luke and introduced herself to Julia Pennyworth which Kate explained was her other assistant, after Mary commented on having two assistants in a real estate firm with no real estate, Kate told her that she was busy and that would have called her the following day, prompting Mary to ask if she was at least a little shaken about their family collapsing a moment before getting out of the building.
The next day, Kate invited Mary at the first place she had bought with her firm, explaining her intention to open a gay bar in it as retaliation to Alessandro's homophobia, to which Mary gladly suggested to be the one to deal with design.
After convincing her step-father, actually Mouse in disguise, Mary went to Kate asking her to join her and her mother at Gotham's annual Humanitarian Ball where Catherine would receive the Humanitarian Award; however her step-sister stated that she couldn't forgive Catherine for what she had done, prompting Mary to said she spent the past months forgiving Beth despite being a murderer to which Kate responded it was different as she was "her family", thus deeply hurting Mary since this implied she was not. The girl then leave their bar, revealing to Kate that Jacob had accepted to do it for her.
That night, she went to the Orpheum Theatre with "Jacob" and Catherine, making a toast of champagne in the latter honor while on their limousine. Then after in the middle of her speech Catherine started to reveal a series of crimes in front of the audience due to Alice blackmail (whose men had surrounded de building infiltrating the Crows) and subsequently collapsed, Mary help to transport her to the back of the stage and called the hospital while "Jacob" left stating that he was going to look for help.
However, as the man leave Alice entered the room revealing that Catherine was poisoned with a Hamilton Dynamics toxin by Mouse posing as Jacob and that she got the antidote with her. After pouring the antidote into a teacup, Alice forced Catherine to apologize to her for the years of suffering she endured because of her deception then, having received said apology, she revealed that Mary was poisoned too and that there was only enough antidote for one of them.
Obeying her mother's last wish, Mary took the antidote. She broke down in tears as Catherine declared that raising her daughter was the only good thing that she had done in her life; Catherine revealed she was aware about Mary's activities with her clinic, much to the latter's shock, and was proud of her. Catherine then succumbed to the poison and died in Mary's arms. Mary desperately performed CPR on Catherine in an attempt to revive her mother, to no avail.
An upset Mary returned to her clinic, where she was reached by Kate. However, Mary spitefully rejected her step-sister, stating that if Kate hadn't given Beth the benefit of doubt so many times, her mother would still be alive. Mary tearfully revealed how Catherine willingly gave up her life to save the former and pointed out that while her mother made mistakes, she didn't deserve to die the way she did. Mary asked Kate one more time if Alice was "worth it", prompting Kate to finally admit she was not. Mary simply responded it was too late and walked off.
During the Anti-Monitor Crisis, Mary as well as everyone in the multiverse except for the seven Paragons, was killed in an antimatter wave by the Anti-Monitor on December 10, 2019, only to be restored a month later, after the Paragons and the Spectre created a new universe.
Working on Jacob's trial
A week later, due to the several critics she received via social for her family and company's corruption, Mary decided to shut down all of her accounts recording a last live to explain all of her followers that it would be better for everyone.Right as she was doing it, Kate entered her secret clinic asking once more how does she felt, however Mary answered with a series of snarky remarks on her twin sister's role in her mother murder. Mary explained that she hired various team of lawyers, including Hewitt & Associates in order to take care of Jacob defense at the trial while Sophie has taken charge of a strike team to arrest Alice and Mouse, also stating that she was busy trying to find a plastic surgeon willing to testify that Mouse was wearing a mask made of skin grafts to pose as her adoptive father. As Kate asked Mary how could she help her, the latter respond telling her that she could ask her sister to stop dissacrating her mother's grave daily, remembering that she knew Alice could have done something that evil, yet Kate choose to ignore her.
Later, Mary called Jacob in prison explaining that she managed to postpone his hearing for a week in order not to have it coincide with Valentine's Day, yet she still had difficulties in finding a professional to testify that "face exchange" could be possible. Jacob replied that she should talk with someone and that despite all the differences of opinion between him and her mother, he never stopped wanting to be her father, to which the latter responded that she had no time for feeling sorry for herself and that she needed to concentrate on what freeing him.That evening, Mary visited Dr. Ethan Campbell after one of his classes at Gotham University asking him to be a witness in Jacob's trial, however the man politely dismissed the idea of a man completely resembling another as sci-fi, suggesting that the girl was still traumatized because of the event. While walking home and talking with Sophie via phone, Mary had the impression of seeing a woman who looked like Alice entering Gotham University and had her sent a strike team, however, few hours later Sophie went at Mary's clinic while she was dismantling it, having become disillusioned at her ability to save people due to losing her mom, and told her that they didn't find the villainess, thus suggesting that the girl was put under extreme duress and she needed to take time to cope with her loss and simply grief for her mother.
The following day, Kate visited Mary in her clinic after she had yet another unsuccessful call to a surgeon. Mary broke down in tears and, without saying a word, the two hugged and reconcile.
Trying to save Beth Kane's doppelgänger
The following day, Sophie informed her that a woman who looked identical to Beth entered Kate's office and had a brief skirmish with the latter, deducing it was the same woman she saw at Gotham University, Mary went at Wayne Enterprises helping Luke and Kate to check the belongins that the mysterious woman left behind; after discovering the intruder's DNA perfectly matched that of Alice - who was still locked under Crows custody - Mary found the doppelgänger's 300 page dissertation on theoretical extragalactic astrophysics and cosmology, thus deciding to go asking Gotham University if someone knew this "Beth".
Later, after Mouse kidnapped Kate asking Alice's release on exchange for her freedom and that of Bryan Akins and Steven Forbes and the other Beth offered to pretend to be Alice in order to save her, Mary helped the woman dress up to look the part of the villain and she was confused because the last time she had looked at Alice, her mom was dying in her arms after being poisoned. Beth told Mary that she couldn't help but feel guilty for this Earth's Beth causing all that harm to her as Alice, to which Mary pointed out she shouldn't feel that way as she was "nothing like that bitch".
Later that night, after Kate, the boys and Beth were all saved, Mary organized a surprise birthday party for her step-sister at the Hold Up together with Luke and Beth; there she told Kate that despite resenting Alice and never really understanding why she wanted to reach her before that day, but after meeting the other Beth she was starting to understand what she missed about her sister. Mary also correctly guessed the existence of the Multiverse, its collapse, and the birth of Earth-Prime, then dismissing it as an impossible idea and watched as, after blowing their cake's candles together with Kate, Beth started to get a splitting headache.Mary and Luke immediately tried to transport Beth at the Gotham General Hospital but they were stopped at a checkpoint of the Crows, who were looking for Alice with the order to kill. They managed to avoid arrest thank to Batwoman's intervention however they are eventually forced to come back at the Wayne Tower, where Mary extracted a blood sample from Beth and analyzed it discovering that her blood cells were rapidly deteriorating, to which the latter theorized that the new Universe was literally not big enough for both her and Alice, who were sucking up life force from each other to stay alive; however Mary claimed that their degeneration would eventually kill them both in seven hours. Shocked, Kate ask Luke, Mary and Beth herself to find a solution as Gotham's most intelligent people, while she tried to stop Sophie's hunt for Alice through all the city. Later, Mary went to her clinic to consult some of her books, however she was approached by Alice, who reminded her of the antidote she drank the night she poisoned her and her mother, which was still in her blood and could cure any disease. The villainess then knocked Mary down and extracted a sample of her blood, however she woke up and, taking advantage of another of Alice's headaches, attacked her eventually managing to subdue and handcuffing her to a cot in her clinic. Alice begged her to have that blood saying it was the only thing that could save her life, to which Mary replied she can't imagine someone less deserving of living.
Then, Mary left her clinic and met with Kate out of the Wayne Tower in order to give her the syringe with her blood explaining that it could make one of the two women's life last longer and she could ever choose to save Beth, one of the most caring persons she met, or Alice, the psycho who killed her mother. Leaving the ultimate choice to her step-sister, Mary left the scene.
Discovering Kate's secret
The following morning, Kate, Luke and Mary discussed the aftermath of Beth's murder; Mary stated that it wasn't supposed to be her the one to die, and tried to comfort Luke about not having been able to protect her. He replied that they need to figure out who the shooter was, prompting Mary to point out they need to prepare themselves for the real Alice, as the Crows now believe her to be dead and that she would probably have a grudge against Kate since she choose to save her doppelgänger over her. Then, Mary told Kate that nevertheless of all the consequences she made the right choice, however Kate commented that it soesn't matter as the wrong Beth survived.
The next day, after confronting Nocturna, Kate had her blood checked by Mary at her clinic, telling her it was because che suspected of having a flu, to which Mary suggested it may be psychosomatic as a manifestation of her guilt for choosing Beth over Alice. After the analysis were completed and she found ketamine into Kate's blood, Mary asked her step-sister how it could be possible, to which Kate was quick to replied that she drunk havily during her real estate classes as "no one whant to take them sober", before leaving the clinic and a perplexed Mary behind.
That night, she went at the opening party of the Hold Up, noticing Sophie among the crowd and telling her to loosen up and enjoy the party despite the agent's claims she was there to work as for Commander Kane's order; she offered Sophie some vodka and persuaded her into flirting with Elle Scantlin, leaving them alone with an excuse after they started to chat.
After this, however, Mary was approached by Andi Ostergaard a woman who followed her on Instagram and had a crush on her, assuming she was a lesbian too, Andi tried to hit on Mary, who was then "rescued" by Luke; when Andi asked if he was her boyfriend Mary quickly lied saying it was her boyfriend's brother, prompting Andi to leave. Luke remarked that she was very firm into stating that he wasn't her boyfriend, to which she blushed a little and simply complimented his phosphorescent tie. After Luke departed to "assist" Kate, Mary looked at the facts that he seem to work 24/7 for her and had an earphone in a suspicious way.
When Mary left the party and headed back home, she noticed a drunk woman in the corner and tried to help her, however as soon as she approached the woman Mary was attacked by Nocturna, who took her to the Gotham Cathedral Church and drained her blood aiming at the Desert Rose-cure Alice gave her. The girl was luckily saved by Batwoman, who managed to defeat Nocturna, and unexpectedly Alice, who gave her a blood transfusion.
Brought back to her clinic in Bennett Ave., she was visited by her step-sister in the following morning and stated she felt fine, enjoying the thought that Batwoman bought her some cookies after saving her and explaining that she does some test in her own blood but found anything abnormal no more.
Later, hearing Nocturna used ketamine-injecting teeth on her victims at Vesper Fairchild's talk show, Mary remembered that Sophie herself told her that Batwoman had been bitten by the villainess during their first fight, so she put the pieces together flashing about Luke's behavior and Batwoman's public coming out, which drove her to finally realize about Kate's secret identity.
The following morning Mary met Sophie at the Hold Up and, seeing how happy she seemed despite being suspended from her job, asked what was happening, to which the latter made her promise not to tell it to anyone and then revealed that she kissed Batwoman, prompting Mary to ask her if she knew her identity. Sophie replied she didn't and asked the same question, but Mary kept the secret over what she have just discovered.
Later, Kate visited her asking her how does she felt since the Serial Slasher started targeting influencers like Mia Cortez and Kimberly Wright, thus making her a potential target. Mary stated that it would be hard as most of her followers abandoned her after her mother publicly confessed her crimes, she listed Kate all the influencers' connections and gossip, explaining many had undergone cosmetic surgery by Dr. Campbell and persistently suggesting that she can help her with her knowledge in the field or her medical skills, however Kate declined and told her to simply be careful.
That night, after having visited Duela's home and found pictures of all of her victims but failing to recognize the next, Kate went back to Mary under the persona of Batwoman. The girl told her that she knew she would have came to her asking help and, after Batwoman asked her how Mary replied that she was observant and intelligent, skills which are too often underestimated. She then correctly recognize the picture of the next victim as Veronica May before changing name and having cosmetic surgery, she also explained where to find her and, after the vigilante stormed off, Mary go take a take away pizza at the Slice of Gotham.
Coming back at her clinic, Mary found Alice and her Wonderland gang stealing medical supplies, her self-proclaimed "sister" explained that she was collecting her debt since she owed her life to her after the blood transfusion with whom she saved Mary from Nocturna. When Alice asked her if Batwoman hasn't told it to her, Mary was puzzled ans asked if she knew who she is, to which the villainess told her she did, pointing out that if she hadn't told it to Mary too, maybe they weren't as close as she believed.
The next morning, before the Hold Up opened, Mary met there with Kate and asked her if she was troubled by something, remembering she could talk about everything with her; Kate simply replied that she failed an important business deal, however Mary asked her if she remembered the first time in which she was transported to her clinic, stating that nor even for a single second she thought that Kate would have reported her to the police or told her to stop, because she trusted her, adding that she hoped that one day Kate would trust her in the same way.
After spreading some flyers that announced a $1,000 reward for anyone with information about a car spotted by some camera near Twin Pines Inn the night of Beth's murder, Mary was approached at her clinic by an individual who introduced himself as Mad Dog, who claimed he have saw said car in a junkyard in the Green; immediately the girl called Luke Fox and asked Mad Dog to tell him the same thing since they believe said car belong to Beth's killer. Despite Mad Dog's thuggish appearance and rough attitude lead Luke not to trust him, Mary believed him and gave him his reward.
Then, the two went to the junkyard indicated by the man, finding the car and ultimately proving Mad Dog to be trustworthy; Luke apologized for having doubt Mary's instint and immediately opened the trunk, finding the rifle that killed Beth. Right in that moment, Mary received an incoming call from an unknown number and, after she answer it, she discovered it was Batwoman seeking her help to save a "bad guy" who just stabbed his own throat. The girl managed to explain via phone how to close the wound with a stapler and, after Batwoman thanked her she told her that she'd be there for her in anytime. Then, as for a sort of spite towards Luke, who insisted on not using "gadgets" during their investigations so as not to be discovered, when he asked her what Batwoman wanted at the phone, Mary replied that it was a "doctor-vigilante secret".
Later that evening, back at the Wayne Tower, while Luke tried to track the car's license plate, Mary tried to find the Batcave's entrance by randomly moving books in the library, only to lie that she was interest in said books after Luke asked her what she was doing. Then, when Luke managed to find out who the car was registered to, she was as surprised as him to find out that it was Mabel Cartwright, who died at the same time her son went into hiding.
After discovering that Reggie Harris' post-conviction hearing was anticipated, Mary reached Luke at Gotham's Temple of Justice moments before it began, grabbed his hand and told him that, having lost a parent herself, she knew how he could feel about facing his father's killer. Luke thanked her to be there and, after she asked where his mother was, he explained she didn't made it as she was unable to stand the situation. Mary stayed at Luke's side for all the process and, after Judge Wellington accepted his appeal for a new trial setting Reggie free until that date, she tried to calm Luke telling him it wasn't over.
Later that evening, while coming back to her secret clinic she found there Sophie intent on tend Julia's arm and began assisting her. The two informed her that they were attacked by a hitman due to a bounty on Sophie's head, guessing that since she was investigating the cover-up of Lucius Fox's murder, that was the reason someone wanted her dead.
Later that night Luke came to her clinic covered in blood and she panicked asking what happened to him, Luke reassured her explaining the blood wasn't his and that Reggie was killed in front of his eyes after telling him he was used as a scapegoat for someone who was probably rich enough to cover-up everything. Mary comforted him and then they both reflect that if Reggie wasn't Lucius killer the real murderer was still at large.
After Batwoman disappear for a week, she started to treat the wounds of various impersonator of the heroine, especially a recurring one who one day came to her clini after a celling fell on top of her breaking her ribs while she was helping people getting free from rubble after the Detonator blew up the Gotham International Bank. Mary severely scolded the woman for her behavior, despite stating that however her heart was on the right place; then the Batwoman copycat asked her if she knew where the real one was since she knew everyone in the city, prompting Mary to answer that she was the last person Batwoman would speak to.
Later, while the Detonator has two bomb planted on Bennett Ave., one on Bobby Reeves and the other under a building, Mary evacuate her clinic of all the people who can walk, helped by the Batwoman copycat and some of her improvised staff, however she decided not to leave the building due to not wanting to left her weaker patient behind. The Batwoman copycat stayed at her side and helped her to secure in the better way possible the remaining patients, yet both Mary and the woman were caught in the explosion.
Having managed to survive with just some minor wound, Mary immediately began helping the other victims getting rid of the rubble, being soon reached by Kate, who had a panic attack after seeing the unconscious woman dressed as Batwoman. Mary told her step-sister that she knew about her secret identity and that it should have been obvious as Mary looked up to her through all her life. Kate replied that she was not an hero, to which Mary replied that the city needed her and she wasn't asking her to be a hero, but rather to keep going.
The following morning, after the Detonator was arrested, Mary visited Kate at the Wayne Tower to shown her an article about Batwoman's return commenting how good she looked in the picture. Luke tried to deny that Batwoman and Kate are one and the same, to which both the girls replied that she knew the truth, prompting Luke to stubbornly keep denying it; thus Kate left, telling Mary and Luke to resolve it themselves.
Member of the Bat Team
A week later, after the Bat Team successfully thwarted the plans of a human traffic ring, Mary held a party to them at Wayne Enterprises in order to celebrate the victory with champagne, and suggested some upgrades for the Batsuit, then after Kate and Luke started to discuss their plans for permanently shutting down the criminals' operations, Mary meekly exited pointing out it was Bat Team stuff and she wasn't part of it.
Later, when Kate was planning to infiltrate the Lookout, managed by infamous mobster Johnny Sabatino, to retrieve Lucius Fox's journal she helped her choose her outfit and even shown her the one she was planning to wear, however Kate told her she won't come with her as it was to dangerous and Julia would be her backup instead. As they left the room, Mary was left visibly saddened.
After both Kate and Julia were captured, Mary was informed by Luke, who asked her to be his tech support while he would go to the club to rescue them, however she stated that it would have been better if she was the one who would have gone there, since Sabatino's cousin Aria owed her a favor for saving her life and because she trusted him to back her up better than she could for him.
Having convinced Luke, Mary infiltrated the Lookour, passed by Reagan's counter asking her a vodka in order to gain strenght, and then met with Aria asking her to brought her where her cousin was; once there she gave Sabatino a suitcase stating she was the heir of Hamilton Dynamics and wanted to take part to his auction to buy the Batsuit for $10,000,000.
Sabatino replied that she could have it after they killed the vigilante, then, taking advantage of a shortcut caused by Luke, Mary used Batman's laser saw to free Kate allowing her to defeat the mobsters and retrieve the journal while Mary was escorted to safety by Julia, who was freed as well thank to her intervention.
Later that night, after the mobsters were all arrested, Kate asked her if she wanted first to be thanked or to heard her apologies, to which Mary played it cooly saying she could choose herself. Then, Kate finally confessed to having always loved Mary like a real sister and, due to having already lost one, she couldn't stand the idea to losing her too, saying she was deeply sorry for having sidelined her and promising she won't do it anymore as she was a member of Bat Team as well. Moved, Mary was unable to reply and simply hugged her step-sister.
Afterwards, Luke brought Mary in the Batcave for the first time and prevented her from taking a picture of it stating that that place must remain a secret, despite in doing so he accidentally revealed her that Bruce Wayne is Batman, leaving her speechless.Kate discovered that Julia interrogated Reagan about the journal's location without informing her, so she began to question her loyalty and argued with Luke about it while Mary listened knowing that Luke was right that Kate shouldn't have let Reagan steal something so important. She watched as Luke left the room stating that he didn't want to be around Kate; she meekly suggested to her step-sister that searching for the item would be easier with Luke around.
Then, while they were investigating the persons kidnapped by the mysterious "Hush", after hearing that the second victim was N.S.A. agent Tony Kim, she made the connection that the first victim, Professor John Carr, taught courses in cryptography at GU so whoever was kidnapping them was trying to decypher the journal.
Later that day, albeit Kate and Mary realize that they could use Carr's pacemaker to track him to his last position and discover where he was taken captive, neither of them had enough computer savvy to do the job. Right at that moment, Parker Torres's girlfriend Gina called Kate at her office and asked for her help as instructed by her girlfriend in case of danger since Parker has been kidnapped, which leaves Mary perplexed.After Parker was rescued and brought to the Batcave, Mary became immediately quite jealous of her and remarked how she was the last to learn her own sister's secret identity. Though Mary would insult her, calling Parker a "random teen" and implying everyone is now allowed to enter the Batcave, she later bonded with Parker on eavesdropping on Kate's relationship status when Sophie came to Wayne Enterprises's office and spoke with Kate about her growing relationship with Julia.
That evening, while helping to upgrade the computers to find the previous locations of Professor Carr's pacemaker, Mary, Kate and Parker learned that he was in Arkham, leading Kate to preparing for an assault on the asylum. Meanwhile, looking around with curiosity through a box with Lucius' belonging, Mary found a pair of eyeglasses and discovered that wearing them she could read the code Lucius Fox used to write his journal, which she quickly informed Kate about right before she ran off to save Luke and Julia.
The following day, after one of Arkham escapee, former tight end for the Gotham Goliaths turned criminal Tim "The Titan" Teslow, started a killing spree in Gotham managing to escape a first confrontation with both Jacob and Kate, Mary shown up at Wayne Enterprises informing her step-sister about him and prompting her to visit the criminal's brother Apollo. However Mary suggested Kate not to go interrogate him as Batwoman due to their father having declared war to the vigilante, insisting that he would never see Batwoman as one of the "good guys", despite Kate being sure she could made him change his mind.
Worried due to Kate being out interrogating Apollo as Batwoman, Mary tried to distrac by following Luke's attempt to destroy Kryptonite using acid and eventually asked him why not to use an hammer, then realizing how stupid it sound told him to ignore her since she was stressed and didn't control what she said.
After Kate's second confrontation with The Titan, Mary reseted her shoulder and tried to convince her to avoid a rematch with him due to her body needing a few weeks to heal, but Kate replied that she didn't have that kind of time. Meanwhile, Luke found a connection in the people that The Titan is targeting due them having all had a role into covering his medical condition, which Mary confirmed just by looking briefly at The Titan's CTs.
Later, Mary took the initiative and came up with a plan that drawn out the Crows using the Bat-Signal on a rooftop telling Jacob that she trusted Batwoman since she protect others without asking for a penny and in order to change the city's perception of the Crows he should work with someone to which the city really has hope to; the girl then watched as Jacob reluctantly accept a truce with Batwoman.
That night, during the ambush for The Titan at Gotham City Arena, Mary followed the operation with Luke at the Batcave and was informed by Julia to be careful since she and Sophie didn't believe in Jacob's change of heart, a suspicious which turned out to be true since Jacob ordered his men to gun down both The Titan and Batwoman, who luckily managed to escape.Later at Wayne Tower, Mary tried to comfort Kate about what happened with their dad and they both agree about feeling betrayed by their father, Kate confessed to Mary that she naively hoped to came clean about being Batwoman to her father one day, after her step-sister broke down in tears saying how hurted she felt for being shooted by Jacob and thanked her for having her back, Mary comforted her and proposed a toast to sisterhood.
Then, Luke arrived revealing that the Kryptonite has been turned to dust thank to Mary's "hammer" idea, prompting the girl to blew the dust off the table. Kate told the two of them that from now on, there wooldn't be any more secrets between them, thus revealing the two about the second shard of Kryptonite that Supergirl gave her during the Crisis, asking Luke and Mary to trust her with it until she can talk to Kara about what to do.
Mary is very excitable, talkative, friendly, and kind of a social butterfly; she is described as her step-sister Kate Kane's polar opposite, with one of Kate's trainers dubbing her as "Girl Who Talks Too Much". Despite coming off as a ditzy socialite, Mary is a very kind-hearted individual who will go to any lengths to help those she loves and the people in need, such as Gotham's underserved communities. Due to the bond she shares with her step-sister Kate, Mary is one of the few individuals who can talk her around.
Because of their differences however, Mary and Kate were never really close, much to Mary's dismay, but she still tried hard to be friendly and supportive of her step-sister. As a result though, Mary harbored some resentment towards Kate for dismissing and only seeing her as a replacement for the latter's biological sister, Beth. Mary even lashed out at Luke Fox over how Kate still favored a serial killer to her despite all her best efforts to be a good sister and began questioning Kate's love for their family after she refused to talk to Mary since she had "work to do" when their parents were about to divorce. However, even when the two of them are at odds, Mary is extremely quick to forgive Kate. When she finally confessed to having always loved her like a real sister and apologised for having sidelined her, Mary was so moved to be unable to reply and simply hugged Kate.
Mary is also quite empathetic and sensitive; she was horrified after discovering that her mother had manipulated the DNA test on Beth's alleged remains in order to gave Jacob and Kate closure, having a very hard time forgiving Catherine for this deception. Mary felt great sorrow when her mother and step-father were about to divorce, and was devastated for being unable to reach and act more sisterly with Kate. Also, despite her animosity towards Alice, she came to befriend her Earth-TUD14 doppelgänger after realizing Beth was nothing like the former. She further demostrated this traits, as well af an impressive stoicism, when chosing not to leave her clinic during a bomb alert in order to stay at the side of her patients who are too weak to be evacuated, or when putting her own life in jeopardy in order to save her step-sister and Julia Pennyworth.
Mary has often proven to be quite an assertive, inquisitive, and free-spirited girl, not bothering about being politically correct when questioning Sophie Moore's sexuality or discussing her past relationship with Kate and the impact it had on her.
After her mother's death, Mary greatly matured, taking full charge of her step-father's trial to prove his innocence in Catherine's murder. In her grief however, Mary also became much more withdrawn, considering shutting down all of her social media accounts and even closing her free clinic, feeling she couldn't be a good doctor when she was unable to save her own mother. However, Mary eventually managed to overcome her grief and decided to continue her path of being a doctor and influencer, keeping both her clinic and social media accounts open.
Powers and abilities
- Healing blood: After taking the universal cure-all Desert Rose as an antidote to Beth Kane's poison, Mary's blood was able to heal allegedly every illness by transfusion. The properties of the blood seemed to vanish after a while since, analyzing her own blood some months after taking the antidote, Mary found nothing abnormal anymore.
- High-level intellect/Great business acumen/Expert tactician/Leader: Mary has proven to be a very savvy, intelligent, and cunning individual. She is extremely skilled strategist and planner, having secretly run her own clinic without getting caught through siphoning funds from Gotham University. Mary dealt with various patients on her own, not having any other staff members. She was also very accurate at orchestrating her movements in order to cover her activities and real interest for medicine by posing as an irresponsible party girl, even to her thousands of social media followers. Mary is also a fairly competent business planner, helping Kate Kane to open her gay bar the Hold Up and taking over its design. She also demonstrated an extraordinary memory and is an excellent tactician, taking charge of the organization of her step-father Jacob Kane's trial defense tactics, and developing a plan to foil the Crows luring them on a roof and give Batwoman a chance to propose Jacob a truce. Mary is so brilliant that after reading Beth Kane's astrophysics notes, she correctly deduced the existence of the multiverse, its collapse, and the birth of Earth-Prime, as well as involuntarily proposing an effective way to destroy Kryptonite. Mary is regarded by Kate as one of the three most intelligent individuals she knew in Gotham, alongside Luke Fox and Beth. She was the first person to correctly deduce Kate's identity as Batwoman on her own.
- Expert of deception: Mary is proven to be extremely skilled in the art of deception, using acting and improvisation skills to make up several stories in a matter of mere seconds in order to try to pass a checkpoint. Mary also managed to trick Johnny Sabatino and several Gotham's mobsters into believing that she was at the Lookout to take part to their auction rather than to saving Batwoman.
- Skilled investigator: Mary is very inquisitive and a capable investigator; she extorted information on Alice's plan from Dodgson while he was drugged. She was also quite helpful in investigating the identity of Beth's doppelgänger when she first appeared. Mary was able to figure out that Kate is Batwoman after connecting a series of clues and helped Kate figuring out Hush's kidnapping pattern.
- Medical knowledge: Although Mary is just a medical student and has not yet achieved her M.D., she has a tremendous amount of medical knowledge, enough to operate her own illegal clinic or identify the exact extension of a brain damage just by looking briefly at a CT. Her medical skills seems to be even greater and more accurate than that of many paramedics and she was able to perform various surgical feats, such as extracting a car hood out of a man's abdomen and help him recover within a night. Mary also displayed a great knowledge of injuries caused by various types of bullets, able to deduce in less than an hour how to better treat the wounds they made without using specific equipment.
- Skilled hand-to-hand combatant: Mary is proven to be a skilled hand-to-hand combatant, capable of holding her own in a fight against Alice and eventually overpowering her when the latter was severely weakened by her headaches.
- Skilled knife-wielder/Knife thrower: Drawing from her knowledge on the human anatomy, Mary has an incredible aim with knives; despite her fear, she was able to stab Dodgson in the leg with remarkable accuracy, debilitating his ability to move.
- Skilled markswoman: Mary knows how to use a gun thanks to training from her step-family.
- Indomitable will: A driven and determined individual, Mary is nearly fearless and almost never gives up under most situations; for example, she chose to stay behind and help her patients during the evacuation of Bennett Ave. due to a bomb alarm, despite knowing full well that nobody knew of her clinic's existence and thus the authorities wouldn't care of evacuating it before detonating the bomb.
- Network: As a member of the social elite and influencer-in-the-making, Mary has a wide array of contacts. She also has various connections between the poor Gothamite communities she helped. In Bennett Ave. she has the reputation to "knowing everyone".
- Gun: Mary carries a gun so that she can protect herself after being nearly killed by Dodgson.
- Laser saw: The device can cut through anything. Mary used it to save Batwoman after she was caught by Johnny Sabatino.
- Mary loves to watch puppy videos on YouTube.
- She's a huge fan of Glam Jams.
- Mary had over 3.5 million social media followers, but lost most of them after the revelation of her mother and step-father's underhanded activities.
- Mary's blood type is B-negative.
- Even though Mary and Beth aren't recognized by law as step-sisters, the two have referred to each other as such.
- Mary is the first character outside of any team of heroes to have correctly guessed the multiverse's existence on her own, although then dismissing it as a "mere speculation".
- It's possible that Mary isn't Jewish like the Kane family as her mother was not and traditionally, all Jewish descent through the maternal line.
Behind the scenes
- In the DC Comics, Mary Elizabeth "Bette" Kane is the original Bat-Girl and served as Batwoman's sidekick and Robin's counterpart. Growing up, she would adopt the alias Flamebird (and later Hawkfire) in response to her counterpart's development as Nightwing.
- Also in the comics, Mary is Kate Kane's younger cousin instead of her step-sister.
- In the TV show is unclear who Mary's father is, much like in the comics, where it's a never clearly specified narrative mystery since, despite she was presented as Kate's cousin, she isn't the daughter of any of the Kane siblings: Nathan (childless), Philip (unmarried), Martha (mother of Bruce Wayne) and Jacob (father of Kate and Beth Kane).
- Her name is likely a nod to a well-known sixteenth-century ballad from Scotland based on an apparently fictional incident about a lady-in-waiting to a Queen of Scotland.