Heavy Metal 2000 is a follow-up to a film which was produced by what two people?
Heavy Metal 2000: Heavy Metal 2000 (also known as Heavy Metal: F.A.K.K.² outside North America) is a 2000 Canadian-German direct-to-video adult animated science fiction film produced by Jacques Pettigrew and Michel Lemire, and directed by Michael Coldewey and Lemire. Heavy Metal 2000:  Starring the voices of Michael Ironside, Julie Strain, and Billy Idol, the film is the follow-up to the 1981 animated cult film "Heavy Metal", which is based on the fantasy magazine of the same name. Heavy Metal (film): Heavy Metal is a 1981 Canadian-American adult animated sci-fi-fantasy film directed by Gerald Potterton and produced by Ivan Reitman and Leonard Mogel, who also was the publisher of "Heavy Metal" magazine, the basis for the film.
Ivan Reitman and Leonard Mogel