Heavy Metal is an animated feature film based on stories from the magazine of the same name, was released in 1981 and was directed by Gerald Potterton. Like the magazine, the film focuses on different fantasy and sci-fi stories that are more geared to an adult audience due to the graphic violence, nudity and sexual themes of the different segments. The Canadian film anthology consists of nine different segments and features the voices of John Candy, Harold Ramis, Eugene Levy, and Joe Flaherty of SCTV fame and features music by Black Sabbath, Devo, Sammy Hagar, Journey, Cheap Trick, Grand Funk Railroad, and more. The film used the rotoscoping technique for some elements which is the process of filming live action sequences, then tracing the film and animating over the footage. The film grossed nearly $20 million when released in 1981 and wasn't officially released on video cassette until 1996 due to legal issues over the film's music rights.