Writing
The Dark Crystal
1982 · Screenplay
Masters of the Universe
1987 · Writer
Supergirl
1984 · Screenplay
The Dark Crystal: Age of Resistance
2019 · Story
The Muppet Show
1976 · Writer
Tales from the Darkside
1984 · Writer
Nate and Hayes
1983 · Writer
Martians Go Home
1989 · Director
Monsters
1988 · Writer
Cry Uncle!
1971 · Angry Man in Parking Lot (uncredited)
1971 · Screenplay
Fore Play
1975 · Writer
The Very Best of the Muppet Show: Volume 3
2001 · Writer
The Very Best of the Muppet Show
1999 · Writer
The Very Best of the Muppet Show: Volume 2
Gonzo Presents Muppet Weird Stuff
1985 · Writer
Running Scared
1980 · Screenplay
Dealing: Or the Berkeley-to-Boston Forty-Brick Lost-Bag Blues
1972 · Writer
Between Time and Timbuktu
The Yattering And Jack
1987 · Director
Fiend of Dope Island
1960 · Producer
Reflections of 'The Dark Crystal'
2007 · Self
Of Muppets & Men
1981 · Self
