- Tim Curry - Zimbo (voice)
- Shelley Duvall - Ocka (voice)
- Edward Winter - Dr. Buzz Kutt (voice)
- Billy Vera - Slickis (voice)
- Bill Fagerbakke - Carl (voice)
- Charlie Adler - Ickis (voice)
- Charlie Adler - Man / Goalie (voice)
- Christine Cavanaugh - Oblina (voice)
- Christine Cavanaugh - Baby (voice)
- Gregg Berger - The Gromble (voice)
- Gregg Berger - Biker / Cower (voice)
- Beverly Archer - The Library Monster (voice)
- Beverly Archer - Woman (voice)
- Marcia Strassman - Harryette (voice)
- Marcia Strassman - Weatherperson (voice)
- Susan Blu - Mom / Hair / Kid 4 (voice)
- Aaron Michael Metchik - Kid 3 / Kid 6 (voice)
- Erik von Detten - Vic / Tough Kid (voice)
- Jarrett Lennon - Kid 1 (voice)
- George Segal - J.B. (voice)
- Andrea Martin - Gromble's Mom (voice)
- Ian Ziering - Gludge (voice)
- Bruce Weitz - Luxor (voice)
- Fyvush Finkel - Jackie the Shtickman (voice)
- Brock Peters - Snorch's Voicebox (voice)
- Brock Peters - The Pool (voice)
- Sven-Ole Thorsen - Lars Halverson (voice)
- Arthur Burghardt - Elban Bigfoot (voice)
- Taj Mahal - Ellis Robinson (voice)
- John Pankow - Blook the Granfaloon (voice)
- William Hootkins - Loch Ness Monster (voice)
- Keith Szarabajka - Skritch (voice)
- Mark DeCarlo - Pitch Monster (voice)
- Stuart Whitman - Mule Morgan (voice)
- Norbert Weisser - Farfegnuton (voice)
- Jason Graae - Z-12 (voice)
- David Workman - X-14 (voice)
- Mitzi McCall - Custodian Monster (voice)
- Peter Bonerz - Sal (voice)
- Conchata Ferrell - Simpah (voice)
- John Rhys-Davies - Head Judge / Zifdo (voice)
- Cynthia Mann - Dizzle (voice)
- Kevin Michael Richardson - Clem Lashinsky / Zooeuh (voice)
- Kevin McBride - Car Wash Man / Skater #1 (voice)
- Candi Milo - Splazu / Skater #2 (voice)
- Drew Neumann
Brock Peters hace el papel de Snorch's Voicebox (voice).
Conchata Ferrell hace el papel de Simpah (voice).
John Rhys-Davies hace el papel de Head Judge / Zifdo (voice).
William Hootkins interpreta a Loch Ness Monster (voice) en la serie.
Charlie Adler interpreta a Ickis (voice) en la serie.
Christine Cavanaugh interpreta a Oblina (voice) en la serie.
David Eccles interpreta a Krumm / Snorch (voice) en la serie.
Gregg Berger interpreta a The Gromble (voice) en la serie.
Jim Belushi interpreta a Simon the Monster Hunter (voice) en la serie.
Kath Soucie interpreta a Blorp 2+4 / Woman (voice) en la serie.
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