• 
  Jack Arnold

  regizor

• 
  Stanley Mann

  scenarist

• 
  Peter Sellers

  Ducesa Gloriana XII / Primul Ministru Rupert Mountjoy / Tully Bascombe
• 
  Jean Seberg

  Helen Kokintz
• 
  William Hartnell

  Will Buckley
• 
  Leo McKern

  Benter
• 
  Austin Willis

  United States Secretary of Defense
• 
  Timothy Bateson

  Roger

• 
  Lionel Murton

  American General at the Pentagon
• 
  David Kossoff

  Professor Alfred Kokintz
• 
  Wally Brown

  Air Raid Warden in Physics Lab
• 
  Colin Gordon

  BBC Announcer
• 
  Guy Deghy

  Soviet Ambassador
• 
  Alan Gifford
• 
  Bill Nagy

  U.S. Policeman

• 
  Harold Kasket

  Pedro
• 
  MacDonald Parke

  General Snippet
• 
  Monte Landis

  Cobbley (as Monty Landis)