James Gunn has confirmed the latest addition to his and Peter Safran’s new DC Universe: House Of Dragon’s Milly Alcock is set to play Supergirl.
“Milly is a fantastically talented young actor, and I’m incredibly excited about her being a part of the DCU,” Gunn said on Instagram. “Yes, I first became aware of her in House of the Dragon but I was blown away by her varied auditions and screen tests for Supergirl.”
Alcock played the young Princess Rhaenyra Targaryen in the first season of HBO’s Game of Thrones spinoff House of the Dragon.
According to Deadline, Alcock beat out CODA actress Emilia Jones and Meg Donnelly (who voices Supergirl in Justice League: Crisis on Infinite Earths Part One) for the role.
We’re not yet sure whether Alcock will play Supergirl in Gunn’s upcoming Superman Legacy movie, but it has been confirmed that she will play the role as envisioned by Tom King, Ana Nogueira and Bilquis Evely in Supergirl Woman Of Tomorrow, which sees Kara Zor-El on an epic revenge-led space quest to help a child whose world has been destroyed.
“She’s Supergirl and she doesn’t give a #%*# about slings and arrows,” King said in response to Alcock’s casting on Instagram. “Perfect casting. Couldn’t be more excited to see Supergirl Woman of Tomorrow, the world Bilquis Evely built, brought to life by this incredible actor.”
Cast confirmed so far for Gunn’s Superman Legacy movie includes David Corenswet and Rachel Brosnahan as Clark Kent and Lois Lane, Nathan Fillion as Green Lantern, Isabela Merced as Hawkgirl, Edi Gathegi as Mister Terrific, Skyler Gisondo as Jimmy Olsen, and Nicholas Hoult as Lex Luthor.
The release of Supergirl Woman Of Tomorrow is TBC. Superman: Legacy will be released on 11 July 2025