• 
  Terence Young

  regizor

• 
  Ewen Solon

  Det. Anderson
• 
  Christopher Lee

  Det. Holt
• 
  Martin Boddey

  Chief of the Lost Valley
• 
  Naima Wifstrand

  Baroness Erland
• 
  George Willoughby

  Bertil
• 
  Sten Lindgren

  Director-General of the Research Inst.
• 
  Peter Blitz

  Anders

• 
  Gösta Cederlund

  Prof. Lind
• 
  Anthony Dawson

  Sven Nystrom
• 
  Nadia Gray

  Kara Niemann
• 
  Norman Macowan

  McTavis, ferry pilot
• 
  Alfred Maurstad

  Trerik
• 
  John McCallum

  Dr. Nils Ahlen
• 
  Jack Warner

  Inspector Peterson

• 
  Mary Laura Wood

  Helga Ahlen

• 
  Harry Waxman

  imagine
• 
  Nino Rota

  departament sunet
• 
  George Willoughby

  producător
• 
  Basil Keys

  second unit director or assist
• 
  Bill Warrington

  special effects
• 
  Terence Young

  scriitor