Gloria is kidnapped and taken to a theater where she is told that she will have "the most exquisite moment of her life." She shares many sexual and intimate experiences on a stage in front of a small masked audience that grows increasingly aroused as the performance progresses. Behind the Green Door is a 1972 American feature-length pornographic film, widely considered one of the genre's "classic" pictures and one of the films that ushered in The Golden Age of Porn. Featuring Marilyn Chambers, who became a mainstream celebrity, it was one of the first hardcore films widely released in the United States. The film is possibly the first U.S. feature-length hardcore film to include an interracial sex scene.