Boris Karloff

Baron Viktor von Frankenstein

Jana Lund

Carolyn Hayes

Don 'Red' Barry

Douglas Row

Charlotte Austin

Judy Stevens

Rudolph Anders

Wilhelm Gottfried

Tom Duggan

Mike Shaw

Irwin Berke

Inspector Raab

John Dennis

Morgan Haley

Norbert Schiller

Shuter

Mike Lane

Hans Himmler / The Monster

Franz Roehn

Cab Driver (uncredited)

Joe Ploski

Station Porter (uncredited)

Jack Kenney

Assistant Cameraman (uncredited)

Otto Reichow

Atomic Reactor Expert (uncredited)

Howard W. Koch