Overview
- The official trailer, released Monday, July 27, shows Adria Arjona as a former Army sniper who must protect her young daughter from escaped genetically engineered super soldiers.
- Director Adam Wingard and writer Simon Barrett reunited on the project and the filmmaker confirmed the story takes place in the same town and continuity as his 2014 film The Guest.
- Dan Stevens appears in heavy prosthetics as a German scientist tied to the experiments rather than reprising his The Guest character, and the cast includes Rebecca Hall, Michael Biehn, Reginald VelJohnson, Eric Wareheim, Drew Starkey, and Alex 'Poatan' Pereira.
- Onslaught is co‑financed by A24 and Lyrical Media, has been rated R for strong bloody violence, some gore, sexual material/nudity, and language, and is scheduled to open in U.S. theaters on September 4, 2026.
- The trailer rollout follows an early San Diego Comic‑Con screening and signals Wingard’s return to smaller‑scale, violent genre work for A24, a move likely to focus marketing on adult horror‑action audiences this fall.