Rick Moranis as David Leary

Tom Arnold as Rosco Bigger - Fang

Julianne Phillips as Victoria Tucker

Carol Kane as Faith Bigger

Jeffrey Tambor as Art Lundstrum

Curtis Armstrong as Clark

Don Knotts as Principal Kokelar

Doug Abrahams as Guard

Faith Prince as Betty Lundstrom

Tony Pierce as Ulf

Blake Bashoff as Ben Leary

Cody McMains as Kirby Bigger

Harry Waters, Jr. as Alan

Stuart Pankin as Gerry

Justin Jon Ross as Young David

Michael Zwiener as Young Fang

Bill Dow as David's Father