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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 features Mia Farrow, John Cassavetes, Ruth Gordon, Sidney Blackmer, Maurice Evans, Ralph Bellamy, Angela Dorian, Clay Tanner, and, in his feature film debut, Charles Grodin. The film chronicles the story of a pregnant woman who suspects that an evil cult wants to take her baby for use in their rituals. Rosemary's Baby earned almost universal acclaim from film critics and won numerous nominations and awards.

From contemporary reviews, Renata Adler wrote in The New York Times that "The movie--although it is pleasant--doesn't seem to work on any of its dark or powerful terms. I think this is because it is almost too extremely plausible. The quality of the young people's lives seems the quality of lives that one knows, even to the point of finding old people next door to avoid and lean on. One gets very annoyed that they don't catch on sooner." Variety stated, "Several exhilarating milestones are achieved in Rosemary's Baby, an excellent film version of Ira Levin's diabolical chiller novel. Writer-director Roman Polanski has triumphed in his first US-made pic. The film holds attention without explicit violence or gore... Farrow's performance is outstanding." The Monthly Film Bulletin stated that "After the miscalculations of Cul de Sac and Dance of the Vampires" Polanski had "returned to the rich vein of Repulsion". The review noted that "Polanski shows an increasing ability to evoke menace and sheer terror in familiar routines (cooking and telephoning, particularly)" and Polanski has shown "his transformation of a cleverly calculated thriller into a serious work of art." Ruth Gordon won the Academy Award for Best Supporting Actress for her performance in this film. Today, the film is widely regarded as a classic; the review aggregator website Rotten Tomatoes gave the movie a 99% rating (68 out of 69 reviews), with the site's consensus describing it as "A frightening tale of satanism and pregnancy that is even more disturbing than it sounds thanks to convincing and committed performances by Mia Farrow and Ruth Gordon". In 2014, Rosemary's Baby was deemed "culturally, historically, or aesthetically significant" by the Library of Congress and selected for preservation in the National Film Registry. Rosemary's Baby was one of Stanley Kubrick's favorite films, according to his brother-in-law and assistant Jan Harlan.

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Rosemary's Baby was one of Stanley Kubrick's favorite films, according to his brother-in-law and assistant Jan Harlan.