- Mischa Auer - Colonel & President
- Paul Maxwell - Commander Spelling U.S.N.
- Nicholas Stuart - Captain Hurley U.S.N.
- Sean Kelly - Simpson
- Alexis Kanner - Garrett
- Robin Hawdon - Williams
- John Barrard - Consul
- Esma Cannon - Consul's Wife
- Kenneth Griffith - Orator
- Marie France Dousset - Françoise
- Michael Kilgarriff - Claude
- Robert Nichols - Bill
- Neil McCarthy - Sergeant
- Tutte Lemkow - Corporal
- Lally Bowers - Mrs. Dewberry
- Laurence Naismith - Admiral Blake
- Andrew Cruickshank - Admiral Filmer
- Walter Fitzgerald - Admiral Thomas
- Ronald Leigh-Hunt - Commander R.N.
- Arthur Lovegrove - C.P.O. Froud
- Jeremy Lloyd - The Midshipman/Dewberry
- Dinsdale Landen - The Midshipman/Bowles
- Michael Bentine - Psychologist
- Rodney Bewes - Recruitment Interviewee (uncredited)
- Dirk Bogarde - Dr. Simon Sparrow (uncredited)
- Peter Brace - Leather Jacket Rebel (uncredited)
- Robert Cawdron - Marcel's Bar Patron (uncredited)
- Graham Crowden - Naval Officer (uncredited)
- Bill Hibbert - Revolutionary (uncredited)
- Andrew Sachs - Short-Changed US Seaman
- Ian Selby - Shocked Man in Cafe (uncredited)
- Guy Standeven - American Naval Officer (uncredited)
- Richard Vernon - Government Official at Enquiry (uncredited)
- David Warner - Sailor Painting Ship (uncredited)
- John Phillips - Rear Admiral
- Wendy Toye
-
Howard Dimsdale
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