Jim Henson as Jen / High Priest, Ritual Master

Kathryn Mullen as Kira, a Gelfling

Frank Oz as Aughra, a Keeper of Secrets / Chamberlain

Dave Goelz as Fizzgig, a Friendly Monster / General, Garthim Master

Steve Whitmire as Scientist (voice)

Louise Gold as Gourmand

Brian Meehl as Ornamentalist / Urzah / Dying Master

Stephen Garlick as Jen (voice)

Lisa Maxwell as Kira (voice)

Billie Whitelaw as Aughra (voice)

Percy Edwards as Fizzgig (voice)

Barry Dennen as Chamberlain / Podling (voice)

Deep Roy as Additional Performer

Kiran Shah as Additional Performer

Jack Purvis as Additional Performer

Bob Payne as Historian, Scroll Keeper

Michael Kilgarriff as General (voice)

John Baddeley as Historian (voice)

David Buck as Slave Master (voice)

Charles Collingwood as Treasurer (voice)

Sean Barrett as Urzah (voice)

Miki Iveria as Podling (voice)

Patrick Monckton as Podling (voice)

Susan Westerby as Podling (voice)

Joseph O'Conor as Narrator / Urskeks (voice)

Thick Wilson as Gourmand (voice)

Jerry Nelson as High Priestess / Dying Emperor (voice)