Henry Victor

as Professor Frederic Hoffner (uncredited)

as Capt. Schultz

as Rudolf Hagerman

as Dr. Miklos Sangre

as Furber (Uncredited)

as Hammil - tall spy boss

as Wildebrandt

as The Saxon Warrior (scenes deleted)

as Hercules

as Baron Ernst von Steuben (U-boat commander)

as Jacques Hamelin

as Thibault d'Aussigny

as Louis Chadwick