Supergirl's release date looms ever nearer. With the second DC Universe (DCU) film due to arrive on June 26, 2026, there are just six months to go – at the time of this article's latest update, anyway – until it takes flight in theaters worldwide.
As rumors spread that Supergirl's first trailer will arrive very soon, too, you'll want to know which actors are part of its cast. I cover the basics about who'll appear in front of the camera in my Supergirl guide. If you want details on which characters they're playing and where you might have seen these stars before, though, consider this piece to be your definitive guide to the film's cast roster.
Spoilers follow for 'Supergirl: Woman of Tomorrow', the comic book series that this movie is heavily inspired by. Full spoilers follow for this year's Superman movie, too, so read on at your own risk.
Milly Alcock as Kara Zor-El/Supergirl
After winning the battle to play the DCU's Supergirl in January 2024, Alcock will reprise her role as Kara Zor-El in the superhero's first silver screen project since 1984's Supergirl film.
I say "reprise", because Alcock made her DCU debut via an amusing cameo at the end of Superman. That 30-second appearance was all I needed to have full confidence in the DCU's Supergirl film, too.
For those unfamiliar with Supergirl, she's the biological cousin of Kal-El/Clark Kent, aka Superman. The only other Kryptonian to survive the destruction of their homeworld, Kara was forced to watch Krypton's demise – a traumatic event that means she's more cynical, rebellious, and world-weary than Supes. Those traits belie her true nature, though, with Kara being just as compassionate as Kal-El and having an equally strong sense of justice to boot.
Superpowers-wise, Kara has an identical skillset to Superman. This includes, but isn't limited to, superhuman strength, speed, endurance, agility, X-ray vision, heat vision, freeze breath, accelerated healing factor, and the ability to fly.
As for Alcock, her big break came in season 1 of House of the Dragon. The first Game of Thrones prequel to air on HBO Max, it saw Alcock play a young Rhaenyra Targaryen. Last seen in Netflix's Sirens, Alcock has also appeared in other shows including Upright, The Gloaming, and Reckoning.
Eve Ridley as Ruthye Marye Knoll
Another rising star, Ridley will have a substantial supporting role in this DCU Chapter One movie. She'll portray Ruthye Marye Knoll, a young warrior who seeks out Supergirl to help Ruthye track down and exact revenge on the man who killed Ruthye's father.
The first image of Supergirl showed Kara in a place that'll be very familiar to DC comic book fans. Indeed, it's the location where the pair meet in 'Woman of Tomorrow', so it's inevitable that Ruthye will encounter Kara in this same locale in the film formerly known as Supergirl: Woman of Tomorrow. Read this piece to find out why DC Studios co-CEO James Gunn changed Supergirl's title.
Like Alcock, Ridley made a name for herself in the form of a highly-anticipated TV project – that being Netflix's 3 Body Problem, the live-action adaptation of Liu Cixin's mind-bending book trilogy. Ridley's working relationship with the world's best streaming service will continue apace, too, with the starlet reportedly set to voice a character in season 2 of the R-rated animated show Blue Eye Samurai.
Matthias Schoenaerts as Krem
After months of speculation, Gunn confirmed (via the DC Studios podcast) that Schoenaerts will play Supergirl's primary villain.
Known as Krem of the Yellow Hills, he's a space pirate who's responsible for murdering Ruthye's father. A skilled hand-to-hand and long-range combatant, Krem won't be a pushover, even for someone as physically powerful as Kara Zor-El.
Another actor with a Netflix association, Schoenaerts is arguably best known for being part of the cast of 2020's The Old Guard and its 2025 sequel. The Belgian actor has also appeared in films including Loft, Bullhead, Rust and Bone, and Amsterdam.
Jason Momoa as Lobo
The first actor to appear as different characters in the DCU and its predecessor the DC Extended Universe (DCEU), Jason Momoa has traded in his DCEU Aquaman role to play a fan-favorite anti-hero in Gunn and Peter Safran's nascent cinematic franchise.
The sole survivor of a near-immortal alien race know as the Czarians, Lobo traverses the cosmos as a motorcycle-riding mercenary. A skilled marksman, Lobo also possesses superhuman strength, staine, agility, and reflexes. He can also heal rapidly and, depending on which era of DC Comics you read, has genius-level intellect.
Lobo was supposed to appear in 'Supergirl: Woman of Tomorrow' – author Tom King confirming as much in a comicbook.com interview in February 2023 – but was eventually cut from the story. However, to honor that original idea, Lobo will have a small but significant role here, with Gunn explaining how Lobo will be a vital part of Supergirl's plot.
His time as Arthur Curry/Aquaman in the DCEU notwithstanding, Momoa has starred in numerous big name projects, including the billion dollar-spinning A Minecraft Movie, Dune, Game of Thrones, Stargate: Atlantis, and See. Most recently, he co-created, executively produced, and starred in Chief of War on Apple TV.
David Krumholtz and Emily Beecham as Zor-El and Alura In-Ze
As the name of Krumholtz's character implies, he and Beecham will portray Kara's parents in this movie. That all but confirms Supergirl will include flashbacks to Krypton's destruction and/or the aftermath of the planet's ruination, and help to establish Kara's current worldview.
Best known for his role in The Santa Claus franchise, Krumholtz has also appeared in flicks including 10 Things I Hate About You, the Harold and Kumar movie series, and Oppenheimer. On the TV front, he recently featured in season 2 of acclaimed Peacock TV Original Poker Face and in season 1 of the multi-award-winning Apple TV Original The Studio.
Meanwhile, Beecham will be familiar to fans of Netflix's genre-bending 1899 TV show, as well as other small-screen projects like Into the Badlands, The Village, King and Conqueror, and The Pursuit of Love. Film-wise, her most notable performance came in 2017's Daphne, which Beecham was nominated for numerous awards for.
Ferdinand Kingsley as Elias Knoll
The latest addition to Supergirl's cast – according to his page on Conway Van Gelder Grant agency website – Kingsley will reportedly play Elias Knoll. He's Ruthye's father who's killed by Krem. Like Krumholtz and Beecham, then, he'll feature in flashback sequences.
Last seen in Netflix's adaptation of The Sandman as Hob Gadling, Kingsley has also recently appeared in season 2 of Prime Video's Reacher adaptation, season 1 of Apple TV show Silo, and the David Fincher-directed Netflix film Mank.
Ouzo the dog as Krypto the Superdog
Another character who made their DCU debut in Superman, Krypto the Superdog will join Kara and Ruthye on their intergalactic journey to find Krem.
A fully CGI character, Kara's loyal canine companion is based on Gunn's own dog Ouzo. A mischievous rescue dog, Ouzo is often namechecked by Gunn as the main inspiration for 2025's Superman. Indeed, Gunn has regularly recounted the tale of how Ouzo was his way-in during Gunn's struggle to come up with the story for the Man of Steel's latest cinematic adventure.
I'll be covering about the first trailer for one of 2026's most exciting new movies when it's released, so keep your eyes locked on TechRadar for more soon.
In the meantime, you can catch Alcock's debut as Supergirl in 2025's Superman, which is out now on HBO max. 1984's Supergirl film, which starred Helen Slater is also available on the streaming platform.
