Diane Franklin as Suzy

Gerrit Graham as Stanley

Mary Woronov as Raquel Putterman

Chad Allen as Sherman

Jon Gries as OD

Bert Remsen as Grampa

Alejandro Rey as Spiro

Randi Brooks as Cherry

Jennifer Richards as Medusa

Sonny Carl Davis as Norton

Ian Patrick Williams as Nutky

William Paulson as Pluthar

John Leamer as Chauffeur

Gregory Moffett as Archive Footage (Robot Monster)

John Mylong as Archive Footage (Robot Monster)

Selena Royle as Archive Footage (Robot Monster)