Adria Arjona and Dan Stevens anchor Adam Wingard’s compact military horror film, which mixes slasher violence, action thrills, dark comedy, and B-movie chaos.
September 1, 2026
A Military Horror Mash-Up
Adam Wingard’s Onslaught is the kind of movie that knows exactly what kind of audience it wants. The 92-minute action horror film combines rogue super-soldiers, a remote New Mexico community, a mysterious government program, and a steadily escalating body count. Rather than building toward elaborate mythology, Wingard keeps the story moving with quick bursts of violence, eccentric characters, and a deliberately pulpy tone.
The premise centers on Celeste, a former Army sniper living with her young daughter in a secluded trailer community. Their lives are disrupted when a group of genetically enhanced killers escapes from a secret military program and begins closing in on the area. From there, Onslaught becomes a survival story with elements of a slasher and an old-school action picture.
Adria Arjona Is the Strongest Element
Arjona gives the film its emotional center as Celeste, a woman whose military background has left her carrying considerable trauma. She is introduced as someone trying to build a quieter life, but the arrival of the killers quickly forces her to return to skills she has spent years trying to leave behind.
The actress handles both sides of the role well. She can play Celeste as vulnerable and protective in one scene before switching into a physically capable action lead in the next. That contrast helps prevent the character from becoming a generic survival hero, even when the screenplay gives her familiar material to work with.
Dan Stevens Embraces the Madness
Dan Stevens has a much more exaggerated role as Hans Kammler, the scientist connected to the experiments that created the film’s super-soldiers. He plays the character with a theatrical, unpredictable energy that fits the movie’s heightened tone.
Kammler could have been little more than exposition with a laboratory coat, but Stevens gives him enough personality to stand out. His scenes bring some of the film’s strangest humor and help establish that Onslaught is not interested in staying completely serious.
The Villains Are Built for a Slasher
The main threat comes from genetically modified former soldiers, with Alex Pereira playing the hulking killer known as the Butcher. The character is designed less as a complicated antagonist and more as an unstoppable physical presence.
That simplicity suits the movie. Once the Butcher appears, the audience understands what he represents: brute force, relentless pursuit, and the possibility that no ordinary weapon will be enough to stop him. It gives the film a recognizable slasher dynamic while allowing the military experimentation premise to provide a different explanation for the violence.
Credit: A24
The Trailer Park Becomes a Battleground
The remote trailer community is one of the film’s smartest choices. Instead of sending its characters through a succession of increasingly generic locations, Onslaught keeps much of the action concentrated in one dusty, isolated environment.
That setting gives the movie a siege-like quality. Celeste and the other residents know the area, creating opportunities for improvised defenses and ambushes as the threat moves through the community. The location also gives the film a Western flavor, with its wide-open desert surroundings contrasting against the cramped trailers and increasingly dangerous hiding places.
The Violence Comes Fast
Wingard does not spend much time waiting for the movie to become violent. Shootouts, close-quarters fights, and bloody kills arrive quickly, giving the film a brisk pace that rarely allows the story to become stagnant.
The practical, physical quality of the violence is part of the appeal, particularly for viewers who enjoy the rougher edge of B-movie horror. Some sequences are staged for shock value more than character development, but that fits the film’s pulpy sensibility. It wants the audience to react first and analyze later.
The Story Is More Scattered
Where Onslaught struggles is in bringing all of its ideas together. The movie introduces a government experiment, genetically enhanced soldiers, Celeste’s military history, a troubled community, and a larger threat involving a potential massacre.
Those ingredients are individually interesting, but they do not always feel like parts of the same story. The screenplay occasionally moves from one idea to another before giving either enough time to develop, which can make the movie feel more like a series of entertaining sequences than a tightly constructed narrative.
That scattered quality is noticeable when the film begins approaching its climax.
Credit: A24
The Countdown Needed a Bigger Payoff
One of the movie’s central ideas involves an impending act of mass violence, which creates the expectation of a major final escalation. The ticking-clock element should make the last section increasingly tense, but the payoff arrives sooner and on a smaller scale than the setup suggests.
That is frustrating because the movie spends enough time establishing the threat that a larger third act feels like the natural destination. Instead, the conclusion can feel abrupt, leaving some of the story’s bigger ideas underdeveloped.
The result is a movie that sometimes feels as though it is ending just as it is becoming fully assembled.
The Supporting Cast Adds Personality
The supporting performers help give the trailer community a sense of life before the action takes over. Reginald VelJohnson brings warmth to the group, while Eric Wareheim provides comic relief as one of the more abrasive residents.
Those characters are not especially deep, but they help make the setting feel like a place worth defending. That matters because the film’s emotional stakes depend on Celeste protecting more than just herself and her daughter.
The problem is that the short runtime leaves limited room for supporting characters to become anything more than recognizable types.
Wingard Leans Into the B-Movie Spirit
The film’s greatest strength may be its refusal to pretend it is something it is not. Onslaught is intentionally loud, strange, bloody, and occasionally ridiculous. Wingard has embraced a classic B-movie sensibility, combining serious action filmmaking with pulpy horror mechanics and moments of dark humor.
That approach makes the movie energetic even when the narrative is uneven. It also gives Onslaught a distinct personality that many more polished studio thrillers lack. The movie is not trying to become a prestige action drama; it wants to be a fun genre ride.
Credit: A24
Arjona Gives It More Than Gore
Without Arjona’s performance, the film could easily have become a forgettable collection of fights and kills. She gives Celeste enough emotional weight to make the stakes matter, particularly in scenes involving her daughter and the consequences of her past.
Her presence also makes the action more convincing. She feels like someone with a history in combat rather than an ordinary protagonist who suddenly discovers she can fight. That credibility allows the movie to move quickly without spending too much time explaining every skill she uses.
The Verdict
Onslaught is messy, bloody, and frequently entertaining. It works best as a throwback to compact genre movies that value momentum, practical action, memorable characters, and a willingness to get strange.
Its biggest weakness is that the screenplay contains more ideas than its runtime can comfortably handle. The military experiments, character histories, countdown structure, and supernatural-feeling violence could have supported a richer story, but several threads are introduced and then left relatively thin.
Still, Wingard’s style and Arjona’s performance give the film enough personality to rise above its familiar pieces.
Rating: 3/5
Final Thoughts
Onslaught does not reinvent the military horror or slasher genres, but it delivers enough energy and personality to make the formula enjoyable. Adria Arjona is the clear standout, while Dan Stevens and Alex Pereira give the film memorable opponents and the trailer-park setting provides an effective battleground.
The movie would benefit from a stronger third act and more time to develop its mythology, but its compact runtime, pulpy tone, and willingness to embrace B-movie excess keep it moving.
FAQs
What is Onslaught about?
The film follows Celeste, a former Army sniper who must protect her daughter and neighbors when genetically enhanced soldiers from a secret military program descend on their remote New Mexico community.
Who stars in Onslaught?
Adria Arjona leads the cast as Celeste, with Dan Stevens, Alex Pereira, Reginald VelJohnson, Eric Wareheim, and other supporting performers.
Who directed Onslaught?
Adam Wingard directed the film, bringing together military action, slasher horror, dark comedy, and pulpy B-movie influences.
Is Onslaught a horror movie or an action movie?
It is a combination of both. The movie uses slasher-style killers and graphic violence while also incorporating military action and survival-thriller elements.
How long is Onslaught?
The film has a runtime of approximately 92 minutes.
Published by HOLR Magazine