• 
  Rod Steiger

  Paul Mason/John Edwards
• 
  Edward G. Robinson

  Theo Wilkins/Dr. Vital
• 
  Bess Flowers

  Ball Dance Extra/Casino Extra
• 
  Charles Sherlock

  Croupier
• 
  Alphonse Martell

  Governor
• 
  Joan Collins

  Melanie/Madame De La Cruz
• 
  Eli Wallach

  Poncho/Baron von Roelitz
• 
  Forbes Murray

  Ball Dance Extra

• 
  Berry Kroeger

  Hugo Baumer aka Fritz
• 
  Jack Chefe

  Ball Dance Extra
• 
  Alexander Scourby

  Raymond Le May
• 
  Marcel Hillaire

  Duc di Salins
• 
  Harold Miller

  Ball Dance Extra
• 
  Sebastian Cabot

  Director of Casino
• 
  Michael Dante

  Louis Antonizzi/Monsieur De La Cruz

• 
  Alan Caillou

  Doctor Gerald Halsey