The upcoming film Supergirl, scheduled for theatrical and IMAX release on June 26, 2026, marks a pivotal moment in the new DC Universe (DCU). Directed by Craig Gillespie and written by Ana Nogueira, the movie is a direct adaptation of the acclaimed comic book miniseries Supergirl: Woman of Tomorrow by Tom King and Bilquis Evely. Unlike previous iterations that focused on a bright, optimistic Kara Zor-El learning the ropes on Earth, this 2026 feature presents a battle-hardened, jaded version of the character who has survived the trauma of watching her home planet perish.

The casting for this production has been a central topic of discussion among fans and industry insiders. Moving away from the continuity of the CW television series and the previous DC Extended Universe (DCEU), the 2026 cast features a mix of rising stars and established Hollywood heavyweights.

Milly Alcock as Kara Zor-El / Supergirl

Milly Alcock takes on the titular role of Kara Zor-El, a casting choice that followed an extensive search. Alcock rose to international prominence through her breakout performance as young Rhaenyra Targaryen in the HBO series House of the Dragon. Her portrayal of a defiant, stoic, and burdened royal made her the frontrunner for James Gunn’s vision of Supergirl.

In the 2026 film, Alcock’s Supergirl is described as a "pixie-ish but attitudinal" character. This version of Kara was raised on a floating fragment of the destroyed Krypton, watching everyone around her die for the first fourteen years of her life. Consequently, she lacks the sunny disposition of her cousin, Superman. Alcock is tasked with bringing a sense of "hardcore" realism to the role, depicting a survivor who is often cynical and finds solace in solitude—or occasionally, in a drink under a red sun where her powers fade, allowing her to feel human.

The selection of Alcock over other high-profile contenders, including Meg Donnelly, signaled a shift toward a more gritty and character-driven interpretation of the Kryptonian hero. Producers have noted that Alcock’s ability to convey deep-seated anger and vulnerability simultaneously was the deciding factor during screen tests.

Matthias Schoenaerts as Krem of the Yellow Hills

The primary antagonist of the film is Krem of the Yellow Hills, portrayed by the acclaimed Belgian actor Matthias Schoenaerts. Schoenaerts is well-known for his intense roles in films such as The Old Guard, Bullhead, and Red Sparrow. His casting brings a formidable presence to the villain, who in the source material is a ruthless space pirate and leader of the Brigands.

Krem is not a typical world-ending threat like General Zod; rather, he is a cruel, opportunistic criminal whose actions spark the film’s central quest for vengeance. In the story, Krem murders the father of a young girl named Ruthye and leaves Supergirl’s super-powered dog, Krypto, severely injured. This personal affront leads Kara and Ruthye on a galactic pursuit to bring him to justice—or simply to take his life. Schoenaerts’ history of playing morally complex and physically imposing characters makes him a perfect fit for a villain who represents the ugliness of the universe Kara must navigate.

Eve Ridley as Ruthye Marye Knoll

Eve Ridley, known for her role in 3 Body Problem, joins the cast as Ruthye Marye Knoll. Ruthye serves as the emotional anchor and co-protagonist of the film. She is a young alien girl from a technologically primitive planet who seeks a mercenary to help her avenge her father’s death.

The dynamic between Ridley’s Ruthye and Alcock’s Kara is the heart of the movie. While Kara is the "muscle" and the weary protector, Ruthye is the narrator and the witness to Kara’s true character. Ridley’s performance is expected to capture the transition from a grief-stricken child to a determined survivor. The film acts as a cosmic "road trip" through the eyes of Ruthye, who observes the sheer scale of Supergirl’s power and the burden that comes with it.

Jason Momoa as Lobo

In one of the most talked-about casting shifts in superhero cinema, Jason Momoa will appear in the 2026 Supergirl film as Lobo. Momoa previously portrayed Arthur Curry/Aquaman in the DCEU, but he has long expressed a desire to play the intergalactic bounty hunter and mercenary known as "The Main Man."

Lobo is a stark contrast to the noble Aquaman. He is a foul-mouthed, cigar-smoking, ultra-violent anti-hero who travels the stars on a space-faring motorcycle. In the context of the Supergirl movie, Lobo’s presence adds a layer of chaotic energy to the cosmic landscape. While his specific role in the plot remains under wraps, Lobo often serves as an unpredictable wild card who can be either an ally or a nuisance to Kara. Momoa’s casting as Lobo is a highlight of James Gunn’s effort to reboot the universe while retaining fan-favorite actors in roles that better suit their personal brand of charisma.

Supporting Cast: Parents and Family

The 2026 film also features a talented supporting cast that fleshes out Kara’s Kryptonian heritage:

  • David Krumholtz as Zor-El: Known for his versatile career in films like Oppenheimer and the series Numb3rs, Krumholtz plays Kara’s father. His role is expected to appear in flashback sequences detailing the fall of Krypton and the desperate measures taken to save Kara.
  • Emily Beecham as Alura In-Ze: The award-winning actress from Little Joe portrays Kara’s mother. Like Zor-El, Alura’s presence highlights the family bonds Kara lost and the legacy she carries throughout her journey across the galaxy.
  • David Corenswet as Superman: While the film centers on Kara, a cameo by David Corenswet’s Superman is anticipated to establish the familial connection and the contrast between their upbringings. Corenswet debuts as Clark Kent in the 2025 Superman film, and his appearance here helps solidify the interconnected nature of the DCU.

The Influence of Supergirl: Woman of Tomorrow

To understand the cast and their roles, one must look at the source material, Supergirl: Woman of Tomorrow. Written by Tom King, this comic was specifically chosen by James Gunn because it redefined Supergirl for a modern audience. It moved her away from the shadow of her cousin and placed her in a high-fantasy, sci-fi epic setting.

The story is narrated by Ruthye, which gives the narrative a unique perspective—treating Supergirl as a legendary, almost mythological figure. The cast reflects the "hardcore" nature of this story. There are no secret identities or office jobs at CatCo in this version. Instead, the characters inhabit a universe filled with alien marketplaces, red sun planets, and ancient cosmic threats. The 2026 cast is assembled to handle this shift from suburban superheroics to a gritty space western.

Behind the Scenes: The Creative Vision

The casting choices were influenced heavily by the creative team led by director Craig Gillespie. Gillespie has a reputation for directing films centered on complicated, often misunderstood female protagonists, such as I, Tonya and Cruella. His involvement suggests a film that will prioritize character study and stylistic flair over generic action beats.

Writer Ana Nogueira was hired after Gunn and Safran were impressed by her take on the character, which reportedly emphasized the emotional weight of Kara’s isolation. The production team, including producers James Gunn and Peter Safran of DC Studios, has made it clear that this Supergirl is a "soft reboot" of the character's cinematic presence, aiming to create a definitive version that can stand alongside the greatest entries in the genre.

Key Differences from the Supergirl TV Series

It is important for audiences to distinguish the 2026 film cast from the long-running CW series starring Melissa Benoist. While the TV show was highly successful and beloved for its optimistic tone and ensemble of Earth-based allies (like Alex Danvers and Martian Manhunter), the 2026 film is an entirely separate entity.

  1. Continuity: The film is part of the DCU Chapter One: "Gods and Monsters," whereas the TV show was part of the "Arrowverse."
  2. Characterization: The 2026 Supergirl is more cynical and world-weary.
  3. Setting: The film is largely set in deep space, moving away from National City.
  4. Cast: The 2026 cast is built around the "Woman of Tomorrow" storyline, featuring characters like Ruthye and Krem who were never central to the TV show’s narrative.

Why 2026 is the Year of Supergirl

The release of Supergirl in 2026 follows the debut of Superman in 2025. This sequencing is intentional, allowing the DCU to establish its cornerstone hero before introducing his more complex cousin. The casting of Milly Alcock and the inclusion of Jason Momoa’s Lobo indicate that DC Studios is willing to take risks to differentiate their new universe from previous attempts. By focusing on a "science fiction epic" rather than a traditional origin story, the 2026 film aims to capture both die-hard comic fans and general audiences looking for a fresh take on the superhero mythos.

Conclusion

The 2026 Supergirl cast represents a bold new direction for one of DC's most iconic characters. With Milly Alcock leading as a more resilient Kara Zor-El, Matthias Schoenaerts bringing gravitas to the villainous Krem, and Jason Momoa making his highly anticipated debut as Lobo, the film is set to be a cornerstone of the new DCU. By grounding the fantastical elements of the "Woman of Tomorrow" comic in strong, character-focused performances, director Craig Gillespie and writer Ana Nogueira are poised to deliver a Supergirl that is as emotionally resonant as it is visually spectacular.

FAQ

Who is playing Supergirl in the 2026 movie?

Milly Alcock, best known for her role in House of the Dragon, has been cast as Kara Zor-El/Supergirl for the 2026 film.

Is the 2026 Supergirl movie a sequel to the TV show?

No, the 2026 film is a complete reboot and is part of the new DC Universe (DCU) overseen by James Gunn. It has no connection to the CW series starring Melissa Benoist.

What is the release date for the Supergirl 2026 film?

The film is scheduled to be released in theaters and IMAX on June 26, 2026.

Will Jason Momoa be in the Supergirl movie?

Yes, Jason Momoa is cast as the intergalactic bounty hunter Lobo, marking a departure from his previous role as Aquaman.

Who is the villain in Supergirl 2026?

The primary villain is Krem of the Yellow Hills, played by Matthias Schoenaerts. He is a space pirate who kills the father of the character Ruthye, sparking the film's plot.

Is Krypto the Superdog in the movie?

Yes, Krypto is a significant part of the story, as the film is based on the Supergirl: Woman of Tomorrow comic where Krypto accompanies Kara on her journey.