Onslaught (2026): Release Date, Cast, Story, Trailer and Everything You Need to Know

Onslaught is shaping up as one of the most explosive action-horror movies of 2026. Directed by Adam Wingard and starring Adria Arjona, the upcoming A24 film combines military action, science fiction, horror and brutal survival thrills. The movie is scheduled to arrive in U.S. theaters on September 4, 2026.

Onslaught Movie: Quick Facts

What Is Onslaught About?

The Onslaught movie follows Celeste, played by Adria Arjona, a former Army sniper and mother who finds herself facing a terrifying military experiment. When a group of genetically engineered super soldiers escapes from a secret facility in the desert, Celeste must use her combat skills to protect her young daughter.

The story mixes a personal mother-daughter survival struggle with a much larger threat. The escaped soldiers are designed to be extremely dangerous, turning an isolated desert community into a deadly battlefield.

The premise gives Onslaught a strong combination of action and horror. Rather than focusing only on military combat, the movie also explores survival, family and the lengths a mother will go to protect her child.

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Adria Arjona Leads the Cast

Adria Arjona takes the central role of Celeste. Her character is both a mother and a highly trained former sniper, making her the film’s main action hero. The movie gives Arjona a physically demanding role as she battles genetically engineered killers while trying to keep her daughter safe.

The cast also includes Dan Stevens as Hans Kammler and Eric Wareheim as Kovacks. Other notable stars include Rebecca Hall, Michael Biehn, Reginald VelJohnson, Drew Starkey and MMA fighter Alex Pereira, who plays The Butcher.

Pereira’s involvement is particularly interesting for action fans because his combat background adds another layer of physical intensity to the movie.

Adam Wingard Returns to Action Horror

Adam Wingard directs Onslaught from a screenplay written with Simon Barrett. The pair previously collaborated on genre projects including You’re Next, The Guest and Blair Witch.

Wingard is also known for directing large-scale movies such as Godzilla vs. Kong and Godzilla x Kong: The New Empire. With Onslaught, he returns to a smaller, more aggressive genre style built around action, horror and practical-looking violence.

The film has also been described as having a connection to The Guest, particularly through its themes of military experimentation and enhanced soldiers.

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Onslaught Trailer and Action

The official Onslaught trailer promises fast-paced fights, dangerous super soldiers and a violent battle for survival. A24’s promotional material places Arjona at the center of the action, while the film’s marketing emphasizes its combination of science fiction, horror and old-school action movie energy.

The movie is rated R for strong bloody violence, gore, sexual material/nudity and language, signaling that it is aimed at adult audiences.

Onslaught Release Date

Onslaught releases in U.S. theaters on September 4, 2026. A24 is distributing the movie theatrically, and the studio currently lists the same September 4 release date.

With Adam Wingard behind the camera, Adria Arjona leading the cast and a premise involving genetically engineered super soldiers, Onslaught could appeal to fans of action-horror, sci-fi thrillers and intense survival movies.

Onslaught (2026) combines a simple but powerful survival story with genetically engineered enemies, military secrets and relentless action. Adria Arjona’s role as Celeste gives the film an emotional center, while Wingard’s experience with action and horror makes the project especially interesting for genre fans.

With its September 4 theatrical release approaching, Onslaught is one of the notable new action-horror movies to watch in 2026.