Rosemary's Baby is a 1968 American psychological horror film written and directed by Roman Polanski, based on Ira Levin's 1967 novel of the same name. The film stars Mia Farrow as a young wife living in Manhattan who becomes pregnant, but soon begins to suspect that her elderly neighbors are members of a Satanic cult who are grooming her in order to use her baby for their rituals. The film's supporting cast includes John Cassavetes, Ruth Gordon, Sidney Blackmer, Maurice Evans, Ralph Bellamy, Patsy Kelly, Angela Dorian, and Charles Grodin in his feature film debut.