Walter Pidgeon
Captain Alan Thorndike
George Sanders
Major Quive-Smith
Heather Thatcher
Lady Alice Risborough
Frederick Worlock
Lord Gerald Risborough
Roger Imhof
Captain Jensen
Holmes Herbert
Saul Farnsworthy
Herbert Evans
Reeves (uncredited)
Cyril Delevanti
Cab Driver (uncredited)
Olaf Hytten
Piel - Saul's Law Clerk (uncredited)
Kurt Kreuger
German Attaché (uncredited)
Lester Matthews
Major (uncredited)
Bobby Hale
Costermonger (uncredited)