Actor
- Greatest Movie Love Scenes (2006) .... Himself
- The 100 Greatest Musicals (2003) .... Himself
- Celebrity Naked Ambition (2003) .... Himself - Contributor
- Circuit (2002) .... Bobby's Doctor
- Headliners & Legends: Brooke Shields (2001) .... Himself
- Crazy in Alabama (1999) .... Bob
- Susan's Plan (1999) .... Doctor #1
- Cannes Man (1996) .... Director
- Big Top Pee-wee (1988) .... Popcorn Vendor (uncredited)
- The Making of 'Summer Lovers' (1982) .... Himself
- Rich and Famous (1981) .... Literary Party Guest
- An Adventure in Filmmaking: The Making of 'The Blue Lagoon' (1980) .... Himself
- Freiheit (1966) .... Boy
- Love Wrecked (2006) ....
- Red Riding Hood (2004) ....
- Royal Standard (1999) ....
- Shadow of Doubt (1998) ....
- It's My Party (1996) ....
- New York News (1995) .... (unknown episodes)
- Honey, I Shrunk the Audience (1994) .... (uncredited)
- Honey I Blew Up the Kid (1992) ....
- White Fang (1991) ....
- Getting It Right (1989) ....
- Big Top Pee-wee (1988) ....
- Flight of the Navigator (1986) ....
- Grandview, U.S.A. (1984) ....
- Summer Lovers (1982) ....
- The Blue Lagoon (1980) ....
- Grease (1978) ....
- The Gathering (1977) ....
- The Boy in the Plastic Bubble (1976) ....
- Dawn: Portrait of a Teenage Runaway (1976) ....
- Family (1976) .... (2 episodes, 1976)
- Starsky and Hutch (1975) .... (2 episodes, 1975-1976)
- All Together Now (1975) ....
- Lucas Tanner (1974) .... (unknown episodes)
- The Rookies (1972) .... (1 episode, 1976)
- Peege (1972) ....
- Marcus Welby, M.D. (1969) .... (4 episodes, 1974-1975)
- It's My Party (1996) .... producer
- Return to the Blue Lagoon (1991) .... executive producer
- Getting It Right (1989) .... producer
- The Blue Lagoon (1980) .... producer
- The Legend of Bigfoot (1976) .... cpi (as Randel Kleiser)
- It's My Party (1996) .... (written by)
- North Shore (1987) .... writer
- Summer Lovers (1982) .... writer
- Gli Esecutori (Street People) (1976) .... writer
- Peege (1972) .... writer