Three young monsters — Ickis, Oblina and Krumm — attends an institute for monsters under a city dump and learn to frighten humans.
Charlie Adler
Christine Cavanaugh
David Eccles
Gregg Berger
Jim Belushi
Kath Soucie
Lacey Chabert
Michael Dorn
Bronson Pinchot
Tim Curry
Shelley Duvall
Beverly Archer
Edward Winter
Billy Vera
Marcia Strassman
Bill Fagerbakke