Neil Hamilton
— Lt. Pierre de Montmalion
Brigitte Horney
— Lena Schmidt
Gyles Isham
— Franz Abel
Ivor Barnard
— Baldhead
Charles Carson
— Henri
Raymond Lovell
— German Secret Service Chief
Frederick Lloyd
— French Secret Service Chief
Leslie Perrins
— J 14
Hay Petrie
— Robert Pigeon
Ben Field
— Karl Schmidt
Ralph Truman
— Prison Guard
Arthur Hambling
— Swiss Official (uncredited)
Vi Kaley
— Bakery Customer (uncredited)
Julian Vedey
— Cabaret Proprietor (uncredited)
Margaret Yarde
— Bakery Customer (uncredited)