Knock Knock is a 2015 thriller film directed by Eli Roth, who also co-wrote the script with Guillermo Amoedo and Nicolás López. The film stars Keanu Reeves, Lorenza Izzo and Ana de Armas. The film was released on October 9, 2015, by Lionsgate Premiere. Knock Knock is a remake of Death Game, which was directed by Peter S. Traynor and starred Sondra Locke and Colleen Camp. All three individuals had a hand in the production of Knock Knock, while Camp also had a cameo in the newer film.

Colleen Celeste Camp is an American character actress and producer. After appearing in several bit parts, she had a lead role in the comedy The Swinging Cheerleaders (1974), followed by roles in two installments of the Police Academy series. Camp had supporting roles in Lady of the House (1978), Apocalypse Now (1979), and The Seduction (1982), after which she played Julie’s mother in Valley Girl and Yvette the Maid in the 1985 comedy Clue.