Supergirl cast announced: Milly Alcock, Jason Momoa lead full DC Universe lineup

DC Studios’ next entry in its relaunch, Supergirl, lands in theaters on June 26 — and its cast ties directly into the new DCU’s unfolding storyline. This rollout matters because it not only introduces a new lead but also connects to last year’s Superman film and sets up character threads for Chapter One.

Spoiler note: the film links to elements seen in 2025’s Superman and adapts beats from the graphic novel Supergirl: Woman of Tomorrow. Read on with that in mind.

Milly Alcock — Kara Zor‑El / Supergirl

Milly Alcock headlines as the Kryptonian cousin of Clark Kent, bringing a younger, world-weary take on a character absent from cinemas since the 1980s. Alcock briefly surfaced in a cameo during the 2025 Superman movie, a moment that signaled this film’s narrative and tonal connections to the broader DCU.

Kara is portrayed as tougher around the edges than her cousin but driven by a familiar moral compass. Expect the movie to explore how tragedy shaped her outlook while showcasing the same suite of abilities associated with the House of El: flight, super strength, enhanced senses and energy projection.

Alcock’s profile rose after a breakthrough television role in House of the Dragon; she has since moved between drama and genre work, making her a recognizable face for mainstream audiences.

Eve Ridley — Ruthye Marye Knoll

Ridley plays Ruthye, a central supporting figure whose personal quest propels a large portion of the film’s action. In the source material, Ruthye recruits Supergirl to help track a killer — a revenge arc likely preserved in this adaptation.

Her casting brings fresh dramatic energy: Ridley recently gained attention on screen through Netflix’s high-profile projects and is set to expand into voice work for animation, underscoring her growing visibility.

Matthias Schoenaerts — Krem

Schoenaerts takes on the film’s primary antagonist, a space‑faring outlaw adapted from the comics as the villain Krem of the Yellow Hills. The character is portrayed as a hardened combatant and the catalyst for Ruthye’s vendetta, ensuring several significant confrontations with Kara.

Known for intense drama and action roles in European and international cinema, Schoenaerts brings a physicality that the part requires.

Jason Momoa — Lobo

Jason Momoa appears as Lobo, the interstellar bounty hunter and anti‑hero whose involvement in the story is described as limited but meaningful. Although Lobo was not in the original graphic novel’s final version, filmmakers have woven him into the plot to add a distinctive, cosmic element.

Momoa’s casting signals the DCU’s willingness to mix genre tones — his past work ranges from blockbuster fantasy to serialized drama — and positions Lobo as a potential recurring presence across future DCU entries.

David Krumholtz & Emily Beecham — Zor‑El and Alura In‑Ze

Krumholtz and Beecham portray Kara’s parents in flashback sequences that illustrate the fall of Krypton and the trauma that shaped Kara’s early life. These scenes aim to anchor her motivations emotionally rather than serving only as spectacle.

Both actors bring varied credits in film and television that should lend gravitas to the familial moments that ground the lead’s arc.

Ferdinand Kingsley — Elias Knoll

Reported casting listings indicate Ferdinand Kingsley will play Elias Knoll, a figure whose fate drives Ruthye’s story. His role appears confined to the past but important for establishing Ruthye’s motivations and the moral stakes of the revenge plot.

Diarmaid Murtagh — Drom Baxton

Murtagh joins the ensemble as a lieutenant among the space pirates aligned with Krem. The character is expected to serve as a direct foil in action sequences and to broaden the film’s roster of antagonists.

Ouzo (the dog) — Krypto the Superdog

Krypto returns to the screen as a fully CGI companion based on director James Gunn’s own rescue dog. In the DCU continuity, the Superdog joins Kara on parts of her journey and adds an emotional and, at times, lighthearted counterpoint to the film’s grimmer themes.

David Corenswet — Kal‑El / Superman

David Corenswet appears in a smaller but narratively meaningful role reprising his Chapter One Superman. His presence reinforces continuity across the DCU films and confirms on‑screen links first hinted at in earlier releases and promotional material.

Scenes featuring both Kara and Kal‑El are likely to clarify their relationship while advancing the shared timeline of the new cinematic universe.

Quick cast snapshot

• Milly Alcock — Supergirl; breakout TV actor, cameo in 2025’s Superman.
• Eve Ridley — Ruthye; revenge-driven ally with recent Netflix exposure.
• Matthias Schoenaerts — Krem; primary antagonist, physical and strategic threat.
• Jason Momoa — Lobo; cameo anti‑hero with franchise potential.
• David Corenswet — Superman; ties film to DCU Chapter One continuity.

Why this matters: Supergirl functions as both a standalone origin and a connective chapter in DC Studios’ larger plan. Casting choices — from a new actress in the title role to established stars in supporting parts — indicate an approach that mixes fresh faces with franchise players to build long‑term narrative threads.

Audiences should expect a film that balances character work with spacefaring action, and one that clarifies how Kara’s worldview differs from Clark’s while keeping both figures in the same cinematic ecosystem. With a June 26 release, Supergirl will be a key marker for how the studio executes Phase One storytelling going forward.