- André Morell - Sir Bernard Spilsbury
- Michael Hordern - Gen. Coburn
- Allan Cuthbertson - Vice-Admiral
- Joan Hickson - Landlady
- Terence Longdon - Larry
- Gibb McLaughlin - Porter
- Miles Malleson - Scientist
- William Russell - Joe
- William Squire - Lt. Jewell
- Richard Wattis - Shop Assistant
- Ronald Adam - Adams
- Robert Brown - French
- Everley Gregg - Club Matron (uncredited)
- Lloyd Lamble - Passport Officer (uncredited)
- Brian Oulton - Wills Officer (uncredited)
- John Welsh - Bank Manager
- Peter Sellers - Winston Churchill (voice)
-
Ian Markus, Kurt Markus
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