James Gunn Says This Casting Is the Best One of His Career

James Gunn is continuing to make waves as co-CEO of DC Studios. After the success of Superman, he is now shaping the next phase of the DC Universe with multiple projects in development.

Gunn wrote a seven-episode animated series called Creature Commandos, inspired by the comic book team, and is also producing Waller, a spin-off of Peacemaker focusing on Amanda Waller. He is also producing the upcoming Supergirl film, set for 2026.

Speaking about casting for the DCU, Gunn praised Milly Alcock as Supergirl. On The Howard Stern Show, he said, “Milly Alcock might be the best bit of casting I’ve done in my entire life. I think she’s absolutely stunning in the movie.” Alcock made her DCU debut in a cameo during Superman.

Alcock gained wide recognition for her role as young Princess Rhaenyra Targaryen in HBO’s House of the Dragon. Critics praised her performance, with critics noting, “The shining star of House of the Dragon’s opening episodes is surely Milly Alcock as Rhaenyra. She’s got an enchantingly expressive face – a simple squinting of the eyes or a pursing of the lips can betray the range of emotions that accompany king’s court politics.” She also earned a Critics’ Choice nomination for Best Supporting Actress in a Drama Series.

The upcoming Supergirl movie, directed by Craig Gillespie and written by Ana Nogueira, stars Alcock as Kara Zor-El. She is joined by Matthias Schoenaerts, Eve Ridley, David Krumholtz, and Emily Beecham.

The film follows Supergirl on a galaxy-spanning quest for revenge. Gunn and Peter Safran are producing the movie as part of DC Studios’ Chapter One: Gods and Monsters.

Supergirl was first introduced in the DC Extended Universe in the 2023 film The Flash, played by Sasha Calle. When Gunn and Safran took leadership of DC Studios in 2022, they reshaped the project, announcing a new adaptation inspired by the comic miniseries Supergirl: Woman of Tomorrow. Alcock was cast in January 2024, and filming took place from January to May in England and Scotland.

The movie is now set to release in the United States on June 26, 2026.

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