- 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 hace el papel de Loch Ness Monster (voice).
Charlie Adler hace el papel de Ickis (voice).
Christine Cavanaugh hace el papel de Oblina (voice).
David Eccles hace el papel de Krumm / Snorch (voice).
Gregg Berger hace el papel de The Gromble (voice).
Jim Belushi interpreta a Simon the Monster Hunter (voice) en la serie.
Kath Soucie hace el papel de Blorp 2+4 / Woman (voice).
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