The Supergirl: Woman of Tomorrow movie has reportedly cast its other protagonist. Deadline reports British child actress Eve Ridley will portray Ruthye Marye Knoll, the narrator of the 2021 comic by Tom King and Bilquis Evely that the film is based upon. A young, stoic alien farmgirl, Ruthye persuades the Girl of Steel (who’ll be played in the film by Milly Alcock) into helping her hunt down the criminal who murdered her father, on a journey that takes the pair to multiple planets.

Eve Ridley in 3 Body Problem
Eve Ridley in 3 Body Problem

Ridley is the third major piece of casting for the film after Alcock (House of the Dragon) as Kara Zor-El, and Belgian actor Matthias Schoenaerts (The Old Guard), who will play Krem of the Yellow Hill, the killer of Ruthye’s father. She is best known for playing Follower on Netflix’s TV series of The Three-Body Problem, and is also set to play Nimue in the fourth season of the streamer’s The Witcher (due out next year); her other roles include the BBC’s Casualty, Peppa Pig, and Isadore Moon.

Directed by Craig Gillespie (Cruella, I, Tonya), Supergirl: Woman of Tomorrow will be released in theaters on June 26, 2026. It will mark the second film in DC Studios’ new universe, after James Gunn‘s Superman (due out beforehand on July 11, 2025), which Alcock will reportedly make her debut as Supergirl in. That film will also mark the first live-action movie appearance from Krypto the Superdog, who has a prominent role in King and Evely’s source material, although whether he will return in the film version has not been confirmed at the time of writing (especially as his role gets a little… upsetting.)

In the meantime, the new DC (Cinematic) Universe will kick off with Creature Commandos, the animated The Suicide Squad/Peacemaker tie-in series, which will premiere on Max on December 5, 2024.