Charlie Adler

Ickis (voice)

Christine Cavanaugh

Oblina (voice)

Gregg Berger

The Gromble (voice)

Jim Belushi

Simon the Monster Hunter (voice)

Kath Soucie

Blorp 2+4 / Woman (voice)

Lacey Chabert

Girl (voice)

Michael Dorn

Borl / Chauffer (voice)

Bronson Pinchot

Deitrich Dunlap (voice)

Tim Curry

Zimbo (voice)

Shelley Duvall

Ocka (voice)

Beverly Archer

The Library Monster (voice)

Edward Winter

Dr. Buzz Kutt (voice)