Austin Trevor

as Prof. Palmer

as Monocle Man (uncredited)

as Sir John Kelly (uncredited)

as Ralston

as Capt. Prada

as Col. Vronsky

as Judson

as Police Commissaire

as Commissioner Wayne

as Dean Foster

as Marquis de Grand Coeur

as The Herald

as Dr. Muller

as Minister with Heart Attack (uncredited)

as Edward Wilton

as Col. Adraxine

as Leopold Dryden

as Schulemberg - German Air Chief of Staff

as Le Beau

as The Duke