Milly Alcock’s ‘Supergirl’ Lands on HBO Max After Theatrical Run

Australian star Milly Alcock’s Supergirl has made the jump from cinemas to streaming, with the latest chapter in DC Studios’ rebooted universe now available globally on HBO Max.

The film landed on the streaming service Thursday, Sept. 10, less than three months after opening in cinemas on June 26.

Directed by Australian filmmaker Craig Gillespie (I, Tonya, Cruella), Supergirl stars Alcock as Kara Zor-El, the Kryptonian cousin of David Corenswet’s Superman.

The Sydney-born actor first appeared as the character in 2025’s Superman, before taking centre stage in her own interstellar adventure.

Based in part on Tom King and Bilquis Evely’s comic Supergirl: Woman of Tomorrow, the film follows Kara as she joins forces with Ruthye Marye Knoll, played by Eve Ridley, on a journey across the galaxy involving vengeance, justice and Kara’s four-legged companion, Krypto.

Matthias Schoenaerts stars as Krem of the Yellow Hills, while the ensemble also includes David Krumholtz and Emily Beecham. Corenswet returns as Superman, with Jason Momoa making his DC Universe debut as Lobo.

Written by Ana Nogueira, the film was produced by DC Studios chiefs James Gunn and Peter Safran and became the second theatrical feature in their interconnected DC Universe following Superman.

Its arrival on HBO Max follows a difficult theatrical run.

Supergirl opened to US$37.1 million in North America and ultimately finished with approximately US$126 million worldwide. The film carried a reported production budget of around US$170 million before marketing costs.

Safran acknowledged the film’s performance in an interview with The New York Times, saying it had not met the studio’s box office expectations while reiterating confidence in DC Studios’ broader long-term strategy.

For Alcock, however, Supergirl represents the biggest leading role yet in a career that has rapidly expanded beyond Australia.

The actor broke internationally playing the young Rhaenyra Targaryen in HBO’s House of the Dragon, before appearing in Netflix limited series Sirens and joining Gunn and Safran’s DC franchise.

The streaming release now gives Supergirl a second opportunity to find an audience at home after its underwhelming cinema performance.

Supergirl is streaming now on HBO Max.