Boris Karloff

Character: Baron Viktor von Frankenstein

Jana Lund

Character: Carolyn Hayes

Don 'Red' Barry

Character: Douglas Row

Charlotte Austin

Character: Judy Stevens

Rudolph Anders

Character: Wilhelm Gottfried

Tom Duggan

Character: Mike Shaw

Irwin Berke

Character: Inspector Raab

John Dennis

Character: Morgan Haley

Norbert Schiller

Character: Shuter

Mike Lane

Character: Hans Himmler / The Monster

Franz Roehn

Character: Cab Driver (uncredited)

Joe Ploski

Character: Station Porter (uncredited)

Jack Kenney

Character: Assistant Cameraman (uncredited)

Otto Reichow

Character: Atomic Reactor Expert (uncredited)