Rosemary's Baby is a 1968 American psychological horror film written and directed by Roman Polanski, based on the bestselling 1967 novel of the same name by Ira Levin. The cast includes Mia Farrow, John Cassavetes, Ruth Gordon, Ralph Bellamy, Maurice Evans, Sidney Blackmer, and Charles Grodin (in his first film appearance). It was produced by William Castle. Farrow plays a pregnant woman who fears that her husband may have made a pact with their eccentric neighbors, believing he may have promised them the child to be used as a human sacrifice in their occult rituals in exchange for success in his acting career. This was Polanski's first entirely American feature film.