Bill Dietrich
Inspector George A. Briggs
Elsa Gebhardt
Charles Ogden Roper
Col. Hammersohn
Johanna Schmidt
Walker (as William Post)
Max Coburg
Adolf Lange
Conrad Arnulf
Gustav Hausmann
Adolf Klein
Luise Vajda
Customs Officer (uncredited)
Saboteur (uncredited)
German Spy Trainee (uncredited)
German Man (uncredited)
Beauty Parlor Customer (uncredited)
Scientist (uncredited)
Intern (uncredited)
Briggs' Aide (uncredited)
Von Wirt (uncredited)
Undetermined Role (uncredited)
Policeman (uncredited)
FBI Agent (uncredited)
Police Sergeant (uncredited)
Narrator (voice) (uncredited)
Self (archive footage) (uncredited)
Major General (uncredited)
Travel Agent (uncredited)
Admiral (uncredited)
Delivery Boy (uncredited)
Morgue Attendant (uncredited)
Dr. Arthur C. Appleton (uncredited)
Germany Spy Trainee (uncredited)
Freda Kassel (uncredited)
Watchmaker (uncredited)
Colonel (uncredited)
Frank Jackson (uncredited)
Toll Booth Attendant (uncredited)
Instructor (uncredited)
Japanese Man (uncredited)
Col. Felix Strassen (uncredited)