Why Millie Alcock Returns as Supergirl in Man of Tomorrow

Think Supergirl's story ended with one film? Not on James Gunn's watch. Millie Alcock has quietly signaled that Kara Zor-El will fly back into the new DCU sooner than fans might expect, and her recent chat on the Happy, Sad, Confused podcast gives us the kind of on-set color that trailers never show.

Alcock first introduced herself to superhero audiences in the 2025 Superman, and then headlined Supergirl under Gunn’s direction in 2026. Different tones. Different stakes. Yet she makes clear that stepping into this next chapter felt less like repeating a beat and more like trying on a new suit—familiar fabric, altered cut. The cast, she says, helped: Nicholas Hoult and David Corenswet brought warmth and ease to long shooting days, turning a high-pressure set into something almost convivial. “I really like Nicholas,” she added with a laugh, the kind of small endorsement that hints at genuine camaraderie rather than PR polish.

Curiosity piqued? There’s more. James Gunn has already hinted that Superman and Supergirl will share the screen again in Superman: Man of Tomorrow, and Alcock confirms she's part of that reunion. She won’t spoil plot points. Of course she won’t. But she did name-check a few colleagues who elevate the project: Alan Tudyk, who plays the robot Gree, was on set and, according to Alcock, brought a comic spark to the proceedings. Lars Eidinger joins as Brainiac — a casting choice that turns heads because this will mark Brainiac’s first live-action appearance in a theatrical DC film.

Superman: Man of Tomorrow teams an uneasy alliance of Superman and Lex Luthor against Brainiac, setting the stage for unexpected partnerships and new threats.

Filming reportedly began in early 1405 of the Persian calendar (early 2026), and the studio is eyeing a summer release on 18 Tir 1406 (July 9, 2027). That timetable means the DC machine is moving fast: build a character in one film, expand her arc in another, then weave her back into the main thread. It's franchise design with intent. Is it risky? Yes. Exciting? Definitely.

Alcock, who previously appeared in House of the Dragon, spoke like someone who’s learning the language of blockbuster filmmaking on the fly. Her tone was candid—she praised co-stars, avoided spoilers, and admitted the challenge of shifting between different atmospheres and narrative textures. That honesty is refreshing in an era where every press line reads like it was carved from the same script. She left listeners wanting more; that’s the point.

Beyond casting gossip and release dates, the bigger story is creative direction. James Gunn’s DCU is not interested in simple repetition. Supergirl’s return feels planned, not opportunistic: a character thread meant to develop across films rather than play cameo ping-pong. If the studio can balance character work with spectacle, Kara’s next chapter could deepen the DC slate at a time when audiences crave fresh emotional anchors as much as they crave new villains.

So what should fans watch for? Chemistry. Tone shifts. The way classic rivalries bend when a greater threat appears. And, most important, how Alcock's Kara grows now that she’s no longer just an introduction but a recurring presence in the new cinematic universe. Stay tuned—this reunion might be more consequential than it looks.