Charles Farrell as Briant Gaunt

Margaret Vyner as Mary Stevens

Fritz Kortner as Minister Peters of Grovnia

Danny Green as Socks, American Henchman

Wallace Evennett as Smith, Bowler-hat Henchman

Monti DeLyle as Pierre, Knife-throwing Henchman

Dino Galvani as Tony, Slender Henchman

Arthur Finn as Mac, Newspaper Editor

Laurence Hanray as Sir George, Lead Conspirator

Arthur Gomez as Baron von Kleisch, Delegate

Raymond Lovell as Harris

Evan John as Dr. Marsh

Reynes Barton as Conference President

Terence O'Brien as Secret Agent Fearns

Dennis Val Norton as Vronsky, Peters' Aide

Billy Bray as Banks

Sydney King as Graham Stevens

Andreas Malandrinos as Zadek

Victor Tandy as Groves