• 
  George Sanders

  General Armstrong
• 
  Maurice Evans

  Dr. Matthews/Alien
• 
  Robert Flemyng

  W.C. Baldwin
• 
  Allan Cuthbertson

  Hindsmith
• 
  Sally Faulkner

  Joanna
• 
  Hilary Heath

  Julie Slade
• 
  Michael Culver

  Lieutenant Bailes
• 
  Larry Dann

  Corporal

• 
  Tony Tenser

  producător
• 
  Hugh Strain

  sound department