Supergirl (2026): James Gunn’s Bold Cosmic Adventure Redefines Kara Zor-El in the New DCU

James Gunn’s Supergirl (2026) brings a darker, cosmic version of Kara Zor-El to the DCU. Here’s everything we know about the story, cast, worlds, and themes.

With Superman and the second season of Peacemaker already laying the foundation for James Gunn’s rebooted DC Cinematic Universe — newly branded as the DCU — the next major step arrives in July with a bold and unexpected reinvention of Supergirl. While Creature Commandos expands the animated side of this universe, Supergirl marks the first truly cosmic journey in Gunn’s opening chapter, introducing audiences to a very different version of Kara Zor-El than the one they may know from past films, television, or comics.

The 2026 movie isn’t just another superhero origin story. Instead, it dives into the darker emotional terrain of a character shaped by trauma, loss, and the weight of expectations she never asked to carry. And with Milly Alcock donning the cape, the DCU is clearly prepared to embrace a Supergirl who is powerful, complex, and far less carefree than earlier adaptations.

A Character With History — and a Chance at Reinvention

Supergirl has appeared on screen before, but not with overwhelming success. The 1984 film starring Helen Slater quickly faded from theaters, though Slater later won fans over by playing Eliza Danvers on The CW’s Supergirl series. That show, led by Melissa Benoist, proved the character could thrive in a shared superhero environment alongside The Flash, Green Arrow, and the Legends of Tomorrow.

But Gunn made it clear from day one: his Supergirl would be drastically different from the sunny, optimistic versions audiences are used to. Instead of leaning into a cheerful cousin-of-Superman dynamic, the new film adapts Supergirl: Woman of Tomorrow, the acclaimed 2021 graphic novel by Tom King, Bilquis Evely, and Mat Lopes. The source material is a raw, emotional, and cosmic adventure that gives Kara a fresh identity — one defined not by Earth, but by the wider universe.