CineGlams Rating: ★★★☆☆ 3/5
Adam Wingard's Onslaught sounds like the kind of movie that should never slow down.
Genetically engineered super-soldiers escape from a secret facility.
A former military sniper finds herself protecting her daughter.
A quiet desert community becomes the battlefield.
Guns come out.
Blood starts flowing.
And the whole thing is wrapped in the deliberately pulpy style of an old-school action-horror B-movie.
That's a fantastic setup.
The question is whether Onslaught delivers on it.
The answer?
Sometimes.
Onslaught has a confident Adria Arjona performance, stylish action-horror imagery and enough blood-soaked B-movie energy to entertain genre fans.
But the movie spends surprisingly long periods preparing for an explosive payoff that isn't quite as wild, intense or satisfying as its title promises.
The result is a lean 92-minute movie that somehow still feels like it could have moved faster.
If you love gritty action-horror, old-school siege movies and intentionally excessive genre filmmaking, there's fun here.
Just don't expect the nonstop chaos suggested by the word Onslaught.
Onslaught Movie Details
Movie: Onslaught
Release Year: 2026
Director: Adam Wingard
Writer: Simon Barrett
Studio/Distributor: A24
Runtime: 1 hour 32 minutes
Rating: R
Genre: Action / Horror / Science Fiction / Thriller
US Theatrical Release: September 4, 2026
Starring:
- Adria Arjona
- Dan Stevens
- Eric Wareheim
- Reginald VelJohnson
- Michael Biehn
- Alex Pereira
- Drew Starkey
- Rebecca Hall
What Is Onslaught About?
The story centers on Celeste, played by Adria Arjona.
Celeste is a former Army sniper and single mother living in a desert trailer-park community.
She has military experience.
She knows how to handle weapons.
And when danger eventually reaches her home, those skills become extremely important.
Elsewhere, genetically modified soldiers escape from a private military facility.
These aren't ordinary soldiers.
They're engineered killing machines designed for violence.
Once they break loose, their path eventually brings them toward Celeste and her community.
That transforms the film into something resembling a combination of:
military conspiracy thriller + slasher movie + siege action film.
The basic concept is deliberately simple.
Bad things are coming.
Celeste has to be ready.
Adria Arjona Is the Movie's Biggest Strength
The clearest reason to watch Onslaught is Adria Arjona.
Celeste could easily have become a generic action heroine.
Instead, Arjona gives the character enough confidence and physical presence to make the central premise believable.
She doesn't spend the movie waiting for somebody else to save her.
Once the threat becomes clear, Celeste knows what she needs to do.
That makes the character particularly satisfying when the action finally arrives.
Arjona also reportedly underwent extensive weapons and stunt preparation for the film, including gun handling and chainsaw work, which helps explain why the physical side of the performance feels convincing.
The movie is clearly designed to position her as a serious action lead.
And on that front, it works.
CineGlams Verdict on Adria Arjona
Performance Rating: ★★★★½ 4.5/5
If Hollywood wants to give Arjona more action roles after this, Onslaught makes a strong argument for it.
The Super-Soldiers Are More Slasher Villains Than Action Villains
One of Onslaught's more interesting ideas is the way its genetically engineered soldiers behave.
They aren't presented like charismatic military villains.
They're closer to slasher-movie monsters.
Quiet.
Relentless.
Extremely difficult to stop.
That allows Wingard to combine two genres.
In one scene, you may feel like you're watching a military conspiracy film.
In another, the enemy behaves more like an unstoppable horror villain stalking victims.
Alex Pereira's character, The Butcher, particularly fits this approach.
The movie doesn't need him to deliver long speeches.
His physical presence does most of the work.
This combination of action and slasher cinema is one of the film's strongest ideas.
The Biggest Problem: Where Is the Onslaught?
The title creates an expectation.
A movie called Onslaught should feel relentless.
Instead, the movie spends a considerable amount of time setting everything up.
We meet Celeste.
We learn about the community.
We see what's happening around the military operation.
The super-soldiers begin moving.
A countdown creates anticipation.
And the audience waits for everything to collide.
The problem is that the buildup sometimes becomes more prominent than the payoff.
That criticism has appeared repeatedly in early reviews. The Associated Press described the movie as surprisingly unhurried despite its premise, while other critics have similarly argued that the climactic violence doesn't fully justify the amount of buildup.
That's the movie's central contradiction.
It looks like chaos.
It promises chaos.
It occasionally delivers chaos.
But it doesn't sustain that chaos long enough.
The Action Is Bloody but Not Constant
When Onslaught finally embraces violence, it can be effective.
Wingard clearly enjoys practical-feeling gore, brutal impacts and exaggerated genre imagery.
The film carries the DNA of older action-horror and grindhouse entertainment.
There's also a first-person-shooter quality to some of the violence, giving certain sequences an intentionally video-game-like feeling.
For some viewers, that will be exactly the attraction.
This is not prestige action filmmaking trying to appear elegant.
It wants to be dirty, violent and slightly ridiculous.
The issue is frequency.
The best sequences make you wish the entire movie operated at the same energy level.
Adam Wingard Returns to His Smaller Genre Roots
Adam Wingard became particularly well known among genre fans through films such as You're Next and The Guest before moving into much larger studio productions.
Onslaught feels like a return toward the smaller, more aggressive type of filmmaking associated with those earlier projects.
The connection to The Guest is especially interesting.
Current coverage describes Onslaught as existing in the same broader universe or functioning as a companion piece to Wingard's 2014 cult thriller.
Fans of The Guest may therefore notice familiar thematic territory:
Military experimentation.
Dangerous enhanced soldiers.
Government secrecy.
Stylized violence.
A strange collision between thriller and horror.
But Onslaught doesn't have quite the same mystery or character tension that made The Guest memorable.
This film is more interested in building toward physical confrontation.
Dan Stevens Brings the Weirdness
Dan Stevens appears as Hans Kammler, and his presence immediately adds a strange, exaggerated quality to the movie.
That's useful because Onslaught works best when it stops pretending to be grounded and embraces its B-movie absurdity.
The supporting cast also includes some fun genre-friendly names.
Reginald VelJohnson.
Michael Biehn.
Rebecca Hall.
Eric Wareheim.
The combination suggests a movie fully aware of the kinds of genre fans it's trying to entertain.
The problem is that several supporting characters feel more like interesting ingredients than fully developed people.
You may enjoy seeing them.
You may wish the screenplay gave them more to do.
The B-Movie Influence Is Everywhere
Onslaught proudly borrows from older genre cinema.
You can feel echoes of:
- 1980s action movies
- Slasher films
- Military conspiracy thrillers
- Siege movies
- Grindhouse cinema
- Super-soldier science fiction
That's intentional.
The movie isn't trying to disguise its influences.
At its best, that creates the feeling of watching an old VHS-era genre movie made with modern filmmaking tools.
At its weakest, the references become more interesting than the story itself.
Several critics have made exactly that complaint, pointing to familiar echoes of earlier action, horror and sci-fi films without enough originality underneath them.
Does Onslaught Have a Good Story?
This isn't really a movie you watch for complicated storytelling.
The central idea is straightforward:
dangerous super-soldiers escape → ordinary community is threatened → highly capable woman fights back.
That can absolutely work.
Simple stories can produce fantastic action movies.
But the characters need personality or the action needs to be exceptional.
Onslaught lands somewhere between those two requirements.
Celeste works.
The concept works.
The atmosphere often works.
The supporting characters are entertaining.
But the screenplay doesn't develop everything deeply enough to make the story especially memorable.
The Atmosphere Is Better Than the Plot
One area where the movie performs better is atmosphere.
Wingard understands how to make a location feel like danger is approaching.
The desert setting helps.
The isolation helps.
The strange military operation helps.
The countdown structure helps.
For significant stretches, Onslaught creates the feeling that something terrible is getting closer.
That's why the eventual action can feel slightly frustrating.
The buildup makes you imagine an even bigger payoff than the movie ultimately provides.
Is Onslaught Scary?
Not particularly.
Despite horror elements, Onslaught isn't primarily trying to terrify the audience.
Its enemies operate like slasher villains, but the movie emphasizes:
violence over fear.
action over supernatural horror.
gore over psychological terror.
If you want something genuinely frightening, this probably won't satisfy you.
If you enjoy action movies with horror DNA, it makes much more sense.
Is Onslaught Gory?
Yes.
This is an R-rated action-horror film and doesn't pretend otherwise.
Expect:
- Bloody violence
- Shootouts
- Brutal attacks
- Gore
- Strong action-horror imagery
Rotten Tomatoes' current critics consensus similarly highlights the film's old-school gore effects and stylish action while criticizing its lack of deeper payoff.
This is definitely not intended as family viewing.
Onslaught Rotten Tomatoes Reception
Early reception has been mixed.
As of this review, Rotten Tomatoes lists Onslaught at roughly 53% from critics, while its verified audience score is currently higher, around 63%. Those numbers can change as additional reviews and audience ratings arrive.
That gap makes sense.
Critics are more likely to notice the familiar genre ingredients and underdeveloped themes.
Action-horror fans may simply enjoy:
Adria Arjona.
Big guns.
Super-soldiers.
Blood.
Dark humor.
And B-movie chaos.
Your reaction will probably depend on which group you resemble.
What Works in Onslaught
Adria Arjona
She carries the film confidently and looks completely comfortable as an action lead.
Genre Combination
Super-soldier action mixed with slasher horror is a fun concept.
Atmosphere
The desert setting and military-conspiracy elements create strong anticipation.
Practical-Feeling Violence
The movie's old-school B-movie aesthetic helps give its action personality.
Short Runtime
At around 92 minutes, the movie doesn't become an enormous commitment.
What Doesn't Work
Too Much Buildup
A movie called Onslaught shouldn't leave viewers repeatedly waiting for the onslaught.
Thin Supporting Characters
Several interesting cast members could have been given more material.
Familiar Story Elements
Fans of older action-horror movies will recognize many ingredients immediately.
Limited Emotional Depth
Celeste's motivation is easy to understand, but the screenplay doesn't build enough deeper character material around everyone else.
The Final Payoff Could Be Bigger
This is the most significant problem.
The concept seems designed for complete insanity.
The movie only partially reaches that level.
Who Should Watch Onslaught?
Watch it if you enjoy:
- Adria Arjona
- A24 genre movies
- Adam Wingard
- The Guest
- You're Next
- 1980s-style B-movies
- Super-soldier stories
- Action-horror hybrids
- Siege thrillers
- Bloody practical effects
- Short, uncomplicated action movies
Who Might Want to Skip It?
You may want to skip it if you prefer:
- Deep character development
- Complex science fiction
- Serious military thrillers
- Nonstop action
- Sophisticated psychological horror
- Completely original genre concepts
Onslaught vs The Guest
Because of the Wingard/Barrett connection, comparisons are unavoidable.
The Guest
Offers more mystery.
More character tension.
A stronger central antagonist.
A cooler slow-burn atmosphere.
Onslaught
Offers more large-scale violence.
More overt action-horror.
A strong female action lead.
More exaggerated B-movie energy.
CineGlams Verdict
The Guest remains the stronger movie.
But Onslaught may appeal to viewers who wanted that universe pushed further toward action and gore.
Is Onslaught Worth Watching in Theaters?
This depends heavily on your taste.
YES — if:
You love loud genre movies and want to experience the gunfire, gore and action with theatrical sound.
MAYBE — if:
You're curious mainly because of Adria Arjona or Adam Wingard.
WAIT FOR STREAMING — if:
You're only moderately interested.
For many viewers, Onslaught feels like exactly the sort of 92-minute genre movie that could work perfectly on a Friday night at home.
Where Can You Watch Onslaught?
As of early September 2026, Onslaught is playing in U.S. theaters and is not yet available as a subscription-streaming title.
Because streaming availability changes by country, audiences in the USA, Canada, UK and Europe should check local listings and platforms before watching.
Is There an Onslaught Post-Credit Scene?
If you're primarily interested in franchise connections, it's better to avoid detailed explanations before seeing the movie.
Given the film's relationship to Wingard's broader genre world, fans may want to remain through the credits and avoid online spoiler discussions until after watching.
Frequently Asked Questions
Is Onslaught a good movie?
Onslaught is an entertaining but uneven action-horror movie. Adria Arjona is excellent and the B-movie style works, but the action payoff doesn't fully match the buildup.
What is Onslaught about?
The movie follows former Army sniper Celeste as she attempts to protect her daughter and community from genetically engineered super-soldiers who escape from a military facility.
Who stars in Onslaught?
The cast includes Adria Arjona, Dan Stevens, Eric Wareheim, Reginald VelJohnson, Michael Biehn, Alex Pereira, Drew Starkey and Rebecca Hall.
Who directed Onslaught?
Adam Wingard directed the film, with Simon Barrett writing the screenplay.
How long is Onslaught?
The runtime is approximately 1 hour and 32 minutes.
Is Onslaught horror or action?
It's a hybrid of action, horror, science fiction and thriller elements, with the super-soldiers frequently functioning like slasher villains.
Is Onslaught connected to The Guest?
The film has been described as connected to or existing within the same broader world as Adam Wingard and Simon Barrett's The Guest.
Is Onslaught streaming?
At the time of publication, the movie is in theaters and has not yet reached subscription streaming in the United States.
Final Verdict
Onslaught has all the ingredients for a gloriously ridiculous action-horror movie.
Adria Arjona as a battle-ready single mother.
Genetically engineered killing machines.
Secret military experiments.
A desert community under attack.
Dan Stevens embracing weirdness.
Guns.
Blood.
And old-school genre influences everywhere.
Unfortunately, the movie spends too much time preparing to explode and not enough time actually exploding.
That doesn't make it bad.
It makes it frustratingly close to being much better.
Adria Arjona delivers exactly what the movie needs from its lead, the atmosphere works and several action moments provide the violent B-movie entertainment fans came to see.
But when a film calls itself Onslaught, you expect absolute mayhem.
This is more of a moderately entertaining attack.
CineGlams Rating: ★★★☆☆ 3/5
Verdict: Worth watching for action-horror and Adria Arjona fans, but casual viewers can comfortably wait for streaming.
CineGlams Review Breakdown
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