https://cdnph.upi.com/ph/st/th/4321785163750/2026/upi/f1e32c3001c0e057e733d1f531fa5231/v1.5/Onslaught-trailer-Adria-Arjona-takes-on-super-soldiers-in-A24-film.jpg" /> "Onslaught," a new action thriller film from "The Guest" director Adam Wingard and starring Adria Arjona, opens in theaters in September.