Charles Farrell
— Briant Gaunt
Margaret Vyner
— Mary Stevens
Fritz Kortner
— Minister Peters of Grovnia
Danny Green
— Socks, American Henchman
Wallace Evennett
— Smith, Bowler-hat Henchman
Monti DeLyle
— Pierre, Knife-throwing Henchman
Dino Galvani
— Tony, Slender Henchman
Arthur Finn
— Mac, Newspaper Editor
Laurence Hanray
— Sir George, Lead Conspirator
Arthur Gomez
— Baron von Kleisch, Delegate
Raymond Lovell
— Harris
Evan John
— Dr. Marsh
Reynes Barton
— Conference President
Terence O'Brien
— Secret Agent Fearns
Dennis Val Norton
— Vronsky, Peters' Aide
Billy Bray
— Banks
Sydney King
— Graham Stevens
Andreas Malandrinos
— Zadek
Victor Tandy
— Groves