George Sanders

as Carl Steelman / Ernst Reiter

Ward Bond

as FBI Chief Craig

Anna Sten

as Frau Reiter

Dennis Hoey

as Col. Taeger

Sig Ruman

as Dr. Herman Holger

Ludwig Stössel

as Papa Julius Steelman

Robert Barrat

as Capt. Kranz

Poldi Dur

as Helga Lorenz (as Poldy Dur)