- For the eponymous character, see Reign (split personality).
- "Who is she?"
- "Worldkiller. The one who will bring about the end of times. This is your purpose, to fight the Devil."
- —Kara Danvers and Thomas Coville
"Reign" is the ninth and midseason finale episode of the third season of , and the fifty-first episode overall. It aired on December 4, 2017.
|Supergirl investigates a mysterious symbol popping up all over National City, tracing its origins back to an ancient prophecy and the mark of the Worldkiller, Reign. Meanwhile, the tension between Lena and Morgan Edge continues to build, causing James to step in and offer up some protection, and possibly igniting a spark in the process.|
- Melissa Benoist as Kara Danvers/Supergirl
- Mehcad Brooks as James Olsen
- Chyler Leigh as Dr. Alex Danvers
- Jeremy Jordan as Winn Schott
- Katie McGrath as Lena Luthor
- Odette Annable as Samantha Arias/Reign
- Chris Wood as Mon-El
- David Harewood as Director J'onn J'onzz
- Carl Lumbly as M'yrnn J'onzz
- Chad Lowe as Thomas Coville
- Erica Durance as Alura Zor-El (hologram)
- Emma Tremblay as Ruby Arias
- Amy Jackson as Imra Ardeen
- Briana Venskus as Agent Vasquez
- Adrian Pasdar as Morgan Edge
- Andre Anthony as Edge’s Assistant
- Dexter Bell as Buyer
- Laura K. MacDonald as Agent #1
- Paul Piaskowski as Seller
- Patrick Rinehart as Agent #2
- Sonia Sunger as News Anchor
- Alison Thornton as Young Girl
"Reign" starts with Samantha awakening from a bad dream. Ruby surges in to comfort her mom, and we discover that Samantha has no memory of going into the desert to find progressively about her modify sense of self Reign.
At the DEO, the gathering is discussing the 31st century with Mon-El and Imra. The last advises that her gathering — the Legion of Super-Heroes — were established to carry on Supergirl's strategic. Mon-El clarifies they erroneously went back in time, and he needs the DEO's assistance of fixing their boat so they can return into what's to come.
Kara welcomes Mon-El and Imra over to her loft for a vacation party, yet the couple decays the welcome.
The majority of the DEO team is there including J'onn, Alex, and Winn, as is Lena Luthor and James Olsen just as J'onn's father M'yrnn. There's a thump at the entryway and it's Samantha and Ruby; they're running late.
Samantha grumbles of a harsh day at work while Alex pulls Ruby out of the way to address inquiries concerning working with Supergirl.
Samantha begins drinking scotch with Lena and prods her supervisor about having a throw with James. Kara concurs that she sees the science among James and Lana too. J'onn approaches Kara and discloses to her he's gotten a call, and they need to go.
The two go to a consumed field, and Kara flies up to get a bird's-eye see. She sees a logo consumed into the fields — it's the logo of Reign.
Kara approaches the multi dimensional image of her mom about the token she saw consumed into the ground. She discovers that the image is Kryptonian, however discovers there isn't a definite interpretation of the logo.
At CatCo, James is sitting in front of the TV sets where the news is showing reports that the city has been vandalized with different cycles of the Reign seal. Lena strolls in and reveals to James that he believes that Morgan Edge is behind the vandalism.
Lena and James approach Morgan at his office about the vandalism, however Edge claims blamelessness.
Mon-El and Imra are out having Christmas Eve supper, and Kara and Winn appear. Seeing that Kara needs to address Mon-El alone, Winn pulls Imra aside for a brew. While she's conversing with Mon-El, Kara gets a gather call from Albatross Bay Correctional.
Kara appears and we discover that it was Thomas Coville — the minister the lead the Cult of Rao — who called her. He's murmuring different Kryptonian-like platitudes before turning upward and revealing to Kara she has a long way to go.
Coville clarifies that the end is close, and that it's Kara's motivation to battle the fallen angel. Kara clarifies that the fiend isn't genuine, however she appears to be reluctant in her own convictions.
Samantha's working at CatCo, and Ruby is ravenous and needs to go eat. Samantha clarifies that she's too occupied to even think about going out so the family babysitter will get Ruby. A resentful Ruby is in the long run quieted down after Samantha converses with her around a couple of the recollections the two offer. Samantha then gives Ruby a present; a neckband of the Supergirl seal.
Kara's conversing with the group at the DEO about Coville's call, and Imra strolls in and says she can help. Imra pulls Kara aside to converse with her about Kara's past with Mon-El. Imra consoles her that Mon-El didn't proceed onward from Kara gently.
Lena and James are researching the images, still under the feeling that it's something that Morgan Edge has been doing. They're pursued and fired at by a shooter, before James stops him with a ricochet.
We see a medication bargain going somewhere around the docks when the lights begin going out. The street pharmacists are taken out by individually by a concealed figure until the last vendor begins fleeing. He's in the long run halted by the shadowy figure, as we see through the figure's first-individual perspective.
Back at her office, Lena and James are attempting to do some exploration on the man who pursued them. They uncover that the shooter recently worked for a meeting Morgan Edge used to work for.
As Lena and James go to take a gander at the mass of TVs, where journalists have started giving an account of twelve posse part passings at the docks, Samanta takes a gander at an image of Edge on Lana's PC before leaving the workplace and tearing separated her shirt, uncovering the primary glance at her Reign ensemble.
At the DEO, Winn uncovers that subsequent to running tests on the consumed field, the consume was brought about by a Kryptonian and not Morgan Edge.
Mon-El apologizing to Kara, that Imra was not her intention to upset her but kara made it clear that she didn't do anything wrong. Kara tells Mon-El she's kind and generous eventhough she looks like a greek goddess and tells she can't find any reason to hate her. She made clear to him that at least two of us still gets be happy. While Kara explaining to Mon-El, She feels she is the third wheel with a heavy heartbreak when Irma is around with Mon-El. She is trying to be okay with Mon-el loving Irma more than her before who leaves since she says since she no longer observes love in his eyes when he is looking at her .
Edge calls Lena to give his sympathies about her endeavored death when Reign begins unleashing destruction on his Christmas celebration. He's ready to stow away in a lead-lined panic room in his office long enough for Reign to take off attempting to discover him somewhere else.
Kara advises the news to the group at the DEO before she takes off attempting to discover the Kryptonian herself, not realizing that it's Reign, the modify sense of self of Samantha.
Morgan Edge assembles a public interview, where he tells columnists that he was assaulted by somebody. He explicitly makes reference to that he can't be sure that is wasn't Supergirl who assaulted him. Lena and James are watching the report when the two present themselves with a glass of bourbon.
Sooner rather than later, the two put their bourbon town and start kissing.
Mon-El and Imra are training happily at the DEO and a Thirdwheel heartbreak Kara looks on. Winn and Alex stroll in to disclose to Kara that Reign has waiting for her where she left her mark.
Rule's remaining on the head of the CatCo building, where she acquaints herself with Supergirl. In the wake of talking, the two start battling.
Kara and Reign's battle overflows into a structure, where the two interfere with an organization occasion party. The two keep battling as "Deck The Halls" plays on out of sight.
The two leave the high rise and battle on a payload transport for a piece before the two fly around National City before halting to battle on a road downtown. Rule's ready to hit Kara over the head with a metal pole, causing her to drain.
Seeing a young lady looking on, Kara gets back up to battle. Rule keeps beating on Kara, before flying her to the head of a structure. Rule drops Kara off the side of the structure, who collides with the walkway underneath.
The DEO specialists swarm the scene and take an unconscious Kara back to the DEO, where she starts slamming.
The next morning, an energized Ruby runs down the stairs at home to wish her mother a Merry Christmas. As she looks around, Ruby sees her mother — who's dressed in all black — peering out the window. Ruby calls out to Sam, who begins to quickly turn around.
- After Edge claims that he likes to spread company cheer, James quips "bah humbug", a phrase spoken by Ebenezer Scrooge in the Charles Dickens novella A Christmas Carol.
- J'onn wishes Winn to play "Jingle Bell Rock" by Hall & Oates in order to introduce his father to them.
- After M'yrnn mentions the Martian holiday Life Day, Winn incorrectly believes that he is speaking about The Star Wars Holiday Special, in which Princess Leia sings a song to the tune of the Star Wars theme.
- After Winn suggests that he has no idea what Star Wars is, J'onn claims the 1980 film The Empire Strikes Back to be "the best movie sequel of all time."
- Reign's heat vision is red, a reference to the traditional color of Kryptonian heat vision.
- This is the first Christmas-themed episode of the series.
- Winn describes the mysterious symbol to be a "Kryptonian 666" when in reality, he should have said 616, as 616 was found to be the correct version of the number of the beast, rather than 666.
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