• 
  Alberto De Martino

  regizor

• 
  Kirk Douglas

  Robert Caine
• 
  Denis Lawson

  2nd Journalist
• 
  Virginia McKenna

  Eva Caine
• 
  Ivo Garrani

  The Prime Minister
• 
  Penelope Horner

  Kate, Caine's Secretary
• 
  Geoffrey Keen

  Gynecologist
• 
  Romolo Valli

  Monsignor Charrier

• 
  Peter Cellier

  Sheckley
• 
  Alexander Knox

  Professor Ernst Meyer
• 
  Spiros Focás

  Harbin
• 
  Massimo Foschi

  Arab Assassin
• 
  Anthony Quayle

  Professor Griffith
• 
  Caroline Langrishe

  Carol, Angelo's Girlfriend
• 
  Adolfo Celi

  Dr. Kerouac

• 
  Simon Ward

  Angel Caine
• 
  Agostina Belli

  Sara Golan
• 
  John Carlin

  Robertson
• 
  Gerard Hely

  Clarke

• 
  Ennio Morricone

  departament sunet
• 
  Enrico Sabbatini

  costume
• 
  Vincenzo Tomassi

  montaj
• 
  Ennio Morricone

  music department
• 
  Edmondo Amati

  producător
• 
  Maurizio Amati

  producător
• 
  Peter James (III)

  set decorator
• 
  Gary Humphreys

  sound department
• 
  Peter Handford

  sound department
• 
  Michael Robson

  scriitor
• 
  Sergio Donati

  scriitor
• 
  Alberto De Martino

  scriitor