Alex D. Linz

Wilhelm 'Billy' von Huber

William Atherton

Ralph Stanton

James Woods

Dr. Wilhelm von Huber

Annabeth Gish

Dr. Donni McGuinness

T.J. Beacom

Ed the Bully

Austin Schwarz

Little Kid

Tony Jay

Narrator (voice)

Jack McGee

Fielding

James Benson

Gertz

Janis Benson

Gerta