Lyle Talbot as Capt. Robert Owen June Duprez as Inga Beckering Victor Varconi as Col. Otto von Ritter George N. Neise as Lt. Erik Falken Charley Rogers as Sgt. Harry Hall Paul Baratoff as Maj. Gen. Heden Leslie Denison as Capt. Ralph Deane Crane Whitley as Doctor Sven Hugo Borg as Dalberg Eric Wilton as Maj. Gen. Lloyd Pierce Lyden as Braun, Ritter's Aide John Beck as Mr. Sandling, Beggar Robert Fischer as Major Von Memel Sigfrid Tor as German Lieutenant Brian O'Hara as Lammet, Radio Broadcaster 'Snub' Pollard as Bertie, Messenger / Orderly Bruce Kellogg as Sentry Beatrice Lillie as Maria Wislack Clive Brook as George, 10th Duke of Bristol Googie Withers as Helen Hale Roland Culver as Richard Halton O. B. Clarence as Doctor Graham Laurence Hanray as Parkes Elliott Mason as Mrs. McCosh Hay Petrie as Hotel manager Mollie Munks as Jeanne Marjorie Rhodes as Cook