A24 Drops Posters and Trailer Tease for Wingard’s Onslaught

The first trailer for Adam Wingard and Simon Barrett‘s Onslaught is now playing in theaters ahead of A24’s Backrooms — and early reactions suggest the duo are very much back in their lane. The official posters have also dropped, and they mean business.

A24 will bring the Onslaught trailer online on June 2, following its theatrical debut. So if you haven’t caught Backrooms yet, you’ve got a window to see it first on the big screen.

Onslaught

The posters feature two taglines: “To stop a killing machine, you must become one,” and “They unleashed their deadliest weapon on us.” Neither of those is subtle. Both of them are correct.

Adria Arjona plays a mother who falls back on a particular set of skills in order to protect her loved ones after she runs afoul of a threat that has escaped a secret military base. That threat is presented in the trailer as a Jason Voorhees-like monster — the villain’s mask even looks like a pitch-black hockey mask at first glance. Alas, not subtle. Very welcome.

Joining Arjona are Dan Stevens (The Guest), Michael Biehn (Aliens), Rebecca Hall (The Night House), Drew Starkey (Queer), Eric Wareheim (Tim and Eric Awesome Show, Great Job!), Reginald VelJohnson (Die Hard), and UFC champion Alex Pereira, who reportedly plays a villain known as The Butcher.

According to Dread Central, the footage is an absolute onslaught of action, violence, and outright ultraviolence — very much in line with the crowd-pleasing mayhem that made The Guest a fan favorite, only cranked up to a considerably bigger scale.

Bloody Disgusting, who caught the trailer in theaters, described the film as feeling like “a Jason Voorhees action movie” — high praise from a publication that has seen every possible iteration of that particular compliment. Comic Book Movie reports that leaked footage circulating online shows Arjona’s character in full action-mode, with nonstop gunfights and brutal combat sequences that have fans already building hype ahead of the online debut.

This is Wingard and Barrett’s first proper genre outing since The Guest in 2014. Wingard spent the years between making Godzilla vs. Kong and its sequel, which is a perfectly reasonable career pivot and also explains why fans have been thirsty for something like this. A24 landed the project after a bidding war back in 2024, with the film wrapping production in January 2025 — making that a 20-month stretch through post-production.

UK audiences, no separate British theatrical date has been confirmed, but A24’s distribution footprint makes a same-window UK release likely. Keep an eye on the BBFC listings once the trailer drops online — if the leaked footage is representative, this one is not arriving rated 12A.

For more from A24’s busy horror slate, check out what they have in the works with their Texas Chainsaw Massacre reimagining and Kristen Stewart‘s vampire film Flesh of the Gods, currently in production.

Onslaught hits theaters September 4, 2026. We’ll keep you posted on updates as the project develops.