Earlier, we reported about Adam Wingard directing a film titled Onslaught for A24. Now, Rebecca Hall has become part of the film's cast. She joins a cast that comprises lead actors Adria Arjona, Drew Starkey, and Dan Stevens as well as Michael Biehn, Reginald VelJohnson, and Eric Wareheim.

Onslaught reunites Wingard with Hall after Godzilla x Kong. Andrew Swett and Aaron Ryder are producing Onslaught through their banner Ryder Picture Company, along with A24 and Lyrical Media. While the makers are yet to disclose much information about Onslaught, according to reports, it is a mix of thriller, horror, and action.

Arjona stars as mother who resides in a trailer and has to revert to her skill set to keep her near and dear ones safe when she comes into conflict with a threat that gets out of a military base. Biehn plays an elite mercenary group's leader, who attempts to keep the threat in check.