Onslaught Plot Summary (No Spoilers)
Somewhere out in the desert, a military experiment has slipped its leash. A squad of super soldiers, genetically engineered to be the ultimate weapon, has gone rogue. These fighters are built for killing and show no mercy, and anyone in their path becomes a target.
Caught in the middle is a mother who also happens to be a trained Army sniper. Her priority is simple: keep her young daughter alive. That means turning her own combat skills against enemies designed to outmatch any ordinary soldier. As the danger closes in, hints of a government conspiracy behind the program start to surface, raising the stakes beyond a single fight for survival.
The film’s tagline, “They unleashed their deadliest weapon on us,” sets the tone. Onslaught blends military action with slasher-style survival horror, pitting a protective parent against a lethal, manufactured threat. Expect a tense, lean story built around pursuit, endurance and brutal confrontations. It packs all of this into a tight 92-minute runtime.
What Makes Onslaught Notable: Director, Writer and Cast
Onslaught is directed by Adam Wingard from a screenplay by Simon Barrett. It is an American, English-language production from A24, made together with Ryder Picture Company, Lyrical Media, Breakaway Civilization and 828 Productions.
The cast is led by Adria Arjona as Celeste and Dan Stevens as Hans Kammler, with Rebecca Hall as Hanna Kammler. The supporting ensemble includes:
- Eric Wareheim as Kovacks
- Reginald VelJohnson as Josiah
- Michael Biehn as Baylor
- Blake Kennedy as Daisy
- Alex Pereira as The Butcher
- Drew Starkey as Cyrus
- Jacob Scipio as Griffin
The film sits at the crossroads of action, horror and thriller. Its ingredients include super soldiers, death squads, a serial-killer edge and heavy gore. It carries an R rating in the US, so viewers should expect brutal, graphic violence.
Looking for a review? Drama4U does not publish personal opinions. Check the Drama4U Score shown on this page for an at-a-glance verdict, and use the genre and content notes above to judge whether it suits your taste.
Who Will Enjoy Onslaught?
- Fans of survival horror and slasher films who like their action extremely violent
- Viewers drawn to military thrillers about super soldiers and secret government programs
- Anyone who enjoys “protective parent” stories with a relentless, high-stakes chase
- Followers of A24’s genre output and of director Adam Wingard
- Fans of Adria Arjona, Dan Stevens or Rebecca Hall
Onslaught Release Date & Where to Watch
- World premiere / first release: 2 September 2026
- US theatrical release: 4 September 2026 (rated R)
- US digital release: 6 October 2026 (rated R)
Where to watch in the US: Onslaught is available digitally.
- Rent: Amazon Video, Apple TV Store, Google Play Movies, YouTube, Fandango At Home and Plex
- Buy: Amazon Video, Apple TV Store, Google Play Movies, YouTube and Fandango At Home
A subscription streaming home is not yet listed in TMDB/JustWatch data as of 24 October 2026.
A trailer is available if you want a preview before renting.
Trailer
Cast
Adria Arjonaas Celeste
Dan Stevensas Hans Kammler
Eric Wareheimas Kovacks
Reginald VelJohnsonas Josiah
Michael Biehnas Baylor
Blake Kennedyas Daisy
Alex Pereiraas The Butcher
Drew Starkeyas Cyrus
Photo: TMDB
FAQ
- When was Onslaught released?
- Onslaught first released on 2 September 2026. In the US it opened in theatres on 4 September 2026 and arrived on digital on 6 October 2026.
- Where can I watch Onslaught?
- In the US you can rent it on Amazon Video, Apple TV Store, Google Play Movies, YouTube, Fandango At Home and Plex. You can buy it on Amazon Video, Apple TV Store, Google Play Movies, YouTube and Fandango At Home. A subscription streaming service is not yet listed in TMDB/JustWatch data as of 24 October 2026.
- Who is in the cast of Onslaught?
- Adria Arjona plays Celeste, Dan Stevens plays Hans Kammler and Rebecca Hall plays Hanna Kammler. The cast also includes Eric Wareheim, Reginald VelJohnson, Michael Biehn, Blake Kennedy, Alex Pereira, Drew Starkey and Jacob Scipio.
- What is Onslaught about?
- A squad of genetically engineered super soldiers goes rogue in the desert. A mother with Army sniper training has to fight to protect her young daughter from them.
- How long is Onslaught and what is it rated?
- Onslaught runs 92 minutes. It is rated R in the US and contains brutal, graphic violence.
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