Ray Milland as Ralph Denistoun

Marlene Dietrich as Lydia

Murvyn Vye as Zoltan

Bruce Lester as Richard Byrd

Dennis Hoey as Hoff

Quentin Reynolds as American Journalist

Reinhold Schünzel as Otto Krosigk

Ivan Triesault as Major Reimann

Hermine Sterler as Greta Krosigk

Leo Schlesinger as Soldier (uncredited)

Greta Ullmann as German Wife (uncredited)

John Dehner as SS Officer (uncredited)

Leslie Denison as Miggs (uncredited)

Larry Simms as Horace (uncredited)

Eric Feldary as Obersturmfuhrer Zweig (uncredited)

Robert R. Stephenson as SS Guard (uncredited)

Gisela Werbisek as German Dowager at Party (uncredited)