House of the Dragon star Milly Alcock will play Kara Zor-El, AKA Supergirl, in the DCU Chapter One 's second big-screen offering. Superman's cousin is set to go on a "murderous quest for revenge" across the galaxy, accompanied by Krypto the Superdog, where she'll come up against Matthias Schoenaerts' Krem of the Yellow Hills.

I would die for Krypto.

In addition to Alcock and Momoa, the cast includes Matthias Schoenaerts as the pirate assassin Krem of the Yellow Hills, Eve Ridley portraying Supergirl's gal-pal Ruthye Marye Knoll, David Krumholtz as Supergirl's father Zor-El, and Emily Beecham playing Supergirl's mother Alura.

Supergirl star Milly Alcock has dropped a big spoiler for the upcoming DC Studios movie, while filmmaker Craig Gillespie confirms that the entirety of the story plays out in space.

Here are 8 major things to look out for in the Supergirl trailer, including story reveals, DC characters, and Easter eggs.

The first trailer for Supergirl signals serious danger for Krypto, the beloved superdog introduced in 2025’s Superman and inspired by James Gunn’s own pet. The film confirms that Krypto belongs to Kara Zor-El, Superman’s cousin, and is her constant companion, living with her and even accompanying her to an intergalactic bar for her birthday.

As James Gunn's Supergirl trailer makes waves, Marvel legend Stan Lee's revelation about his favorite DC character has surfaced.

Gillespie (“Cruella,” “I, Tonya”) directs “Supergirl” from a script by Ana Nogueira, who is also penning the upcoming “Wonder Woman” reboot. The movie is based on the comic series “Supergirl: Woman of Tomorrow” by Tom King.