Irving Pichel

as Narrator (voice) (uncredited)

as Dr. Herbert Stander

as Rocco

as Prosecutor

as Mr. Gorman

as Huger

as Simmons

as Sandor

as U.S. District Attorney

as Apollodorus

as Sergei Pavlov

as Jake Bello

as Clayton's Attorney (uncredited)

as Dr. Decosta

as Lee Goodwin

as Fagin

as District Attorney Clark

as Yamadori

as Rufe Waters

as Hardy Livingstone

as District Attorney Orville Mason

as Philip Endicott