James Gunn Praises Milly Alcock as the "Best Casting" in DC’s Supergirl

Introduction

DC Studios co-CEO James Gunn has made headlines by calling Milly Alcock’s casting as Supergirl possibly “the best I’ve ever done.” The actress, known for her breakout role as Rhaenyra Targaryen in HBO's House of the Dragon, will star in the upcoming DC Universe film Supergirl: Woman of Tomorrow, set for release on June 26, 2026. This announcement has fans buzzing, signaling a fresh, bold take on the iconic superhero.

Milly Alcock as Supergirl: What We Know

In an interview on SiriusXM's Howard Stern Show, Gunn 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’s brief cameo in Gunn’s Superman earlier this year hinted at her potential, but this film marks her full debut as Kara Zor-El, Superman’s cousin.

Promotional stills show Alcock in a rugged, hybrid costume: a blue top with the iconic “S” shield, red skirt, yellow belt, and a tan jacket. The icy, blue-hued backdrop suggests dramatic and cosmic settings, reflecting the film’s ambitious scale.

James Gunn says Milly Alcock as Supergirl might be the best casting he’s ever done.

“I think she’s absolutely stunning in the movie”

(Source: @SIRIUSXM) pic.twitter.com/uCwpqTBkwZ

— DiscussingFilm (@DiscussingFilm) September 10, 2025

Plot Overview of Supergirl: Woman of Tomorrow

Directed by Craig Gillespie (Cruella, I, Tonya), and based on Tom King and Bilquis Evely’s acclaimed miniseries, the film follows Supergirl on a cosmic journey of revenge and self-discovery. After a young alien girl enlists her help to avenge her father’s death, Supergirl navigates a universe filled with enemies and moral dilemmas.

The script is written by Ana Nogueira, with Gunn and DC Studios co-head Peter Safran producing. This fresh storyline aims to give Supergirl a grittier, emotionally rich portrayal distinct from previous adaptations.

Supporting Cast Highlights

• Matthias Schoenaerts – Villainous Krem of the Yellow Hills
• Eve Ridley – Ruthye Marye Knoll, the young alien girl
• David Krumholtz – Zor-El, Supergirl’s father
• Emily Beecham – Alura In-Ze, her mother
• Jason Momoa – Lobo, reprising his anti-hero role

This ensemble promises layered storytelling and intense on-screen dynamics.

Fan Reactions and Social Media Buzz

The casting news, first shared via @DiscussingFilm on Twitter, quickly went viral:

• 119,434 likes
• 4,039 reposts
• Over 3 million views

Fans are comparing Alcock’s potential to iconic performances like Margot Robbie’s Harley Quinn. Positive reactions highlight Alcock’s talent and fresh approach, while some humorous comments reference Gunn’s past playful remarks on social media.

Any day! pic.twitter.com/OjXH8rkT3u

— COCworld🎥 (@Caughtoncam_1) September 10, 2025

Why This Casting Matters for DC Universe

Milly Alcock’s casting represents DC Studios’ commitment to blending fresh talent with established storytelling. With Gunn overseeing a soft reboot of the DCU, including Superman and Creature Commandos, Alcock’s Supergirl may redefine the character for modern audiences, emphasizing her Kryptonian heritage and emotional complexity.

FAQs

Q1: When is Supergirl: Woman of Tomorrow releasing?
A1: The film is scheduled for June 26, 2026.

Q2: Who plays Supergirl in this new DC film?
A2: Australian actress Milly Alcock, known for House of the Dragon.

Q3: Who directed the movie?
A3: Craig Gillespie, acclaimed for Cruella and I, Tonya.

Q4: Is James Gunn producing the film?
A4: Yes, alongside Peter Safran.

Q5: Will Jason Momoa appear?
A5: Yes, he reprises his role as Lobo.

Conclusion

James Gunn’s high praise for Milly Alcock signals a pivotal moment for DC’s cinematic universe. Her portrayal of Supergirl promises a compelling mix of raw emotion, cosmic adventure, and superhero gravitas. Fans and critics alike are watching closely, as this casting could define the next generation of DC heroes. With a talented supporting cast, a visionary director, and Gunn’s creative oversight, Supergirl: Woman of Tomorrow is poised to become one of 2026’s most memorable superhero films.

Alcock’s performance may not only set a new standard for Supergirl but also cement her place among Hollywood’s rising stars. This is more than a casting decision—it’s a statement about DC’s evolving vision, where bold choices meet iconic storytelling.