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