This comes alongside the release of the film's first teaser trailer, which showcases Milly Alcock as Kara Zor-El in a raw, unpolished light.
The teaser, unveiled by Warner Bros., introduces audiences to a Supergirl who's far from the polished ideal often seen in female-led superhero films.
It opens with Kara celebrating her birthday in a decidedly human way: getting drunk, dancing solo, and hyping herself up with affirmations like "23 will be the best year yet."
But it's not all light-hearted; the clip quickly shifts to high-stakes action, where Kara unleashes her powers—heat vision, super strength against villains, and soaring into space.
A poignant line underscores her contrast to her cousin, Superman (played by David Corenswet in the interconnected DC Universe): "He sees the good in everyone – and I see the truth."
Gunn, who introduced the teaser at a special preview event on December 7, 2025, emphasized the character's imperfections during the panel.
"So many times, female superheroes are so perfect, and she's not that at all. She's very imperfect, which male superheroes have been allowed to be for a while," Gunn stated.
He praised Alcock's performance, noting the "swagger" she brings from her role in House of the Dragon, which adds depth to Kara's portrayal.
This isn't the first time Gunn has teased this direction; back in July, he described the DCU's Supergirl as "a total mess," highlighting how her upbringing differs from Superman's, leading to a more rugged and complex hero.
Director Craig Gillespie, known for films like I, Tonya and Cruella, echoed Gunn's sentiments, describing Kara as burdened with "a lot of baggage and a lot of demons."
He promised a film that's "really surprising" and deviates from the standard superhero formula, focusing on a human-centric story that evokes empathy while incorporating humor.
"It's not what you expect from a superhero movie," Gillespie added, emphasizing the emotional layers that make the character relatable.
Alcock herself, viewing the teaser for the first time at the event, reacted with wide-eyed enthusiasm.
"That's crazy. That's so weird," she said, calling the experience "really surreal seeing everyone's work come together."
The Australian actress, who rose to fame as young Rhaenyra Targaryen in HBO's House of the Dragon, beat out thousands in a global search for the role, marking her major Hollywood debut.
The film, set for release on June 26, 2026, is based on Tom King's acclaimed comic Supergirl: Woman of Tomorrow.
It follows Kara on a cosmic journey of revenge and self-discovery after a tragic event on her adopted planet.
The cast also includes Jason Momoa as the interstellar bounty hunter Lobo, adding a gritty edge to the narrative.
This project is part of the rebooted DC Universe under Gunn and Peter Safran's leadership, following Superman (2025) and aiming to blend epic spectacle with character-driven stories.
Gunn's approach signals a shift in superhero cinema, prioritizing authenticity over perfection—especially for female leads.
As fans eagerly await more glimpses, this "messy" Supergirl could redefine what it means to be a hero in the modern age.
