Kenneth More
Lt. Cmdr. Robert Badger
Lloyd Nolan
Vice Admiral Ryan
Joan O'Brien
Lt. Carol Blair
Derek Fowlds
Carson
John Le Mesurier
George Dewberry Sr.
Brian Wilde
Petty Officer Gilors
Warren Mitchell
'Honest' Marcel
Wanda Ventham
Dartmouth Girl
Sid James
Dance Instructor
Mischa Auer
Colonel & President
Alexis Kanner
Garrett
Robin Hawdon
Williams
Esma Cannon
Consul's Wife
Kenneth Griffith
Orator
Robert Nichols
Bill
Neil McCarthy
Sergeant
Tutte Lemkow
Corporal
Laurence Naismith
Admiral Blake
Andrew Cruickshank
Admiral Filmer
Walter Fitzgerald
Admiral Thomas
Ronald Leigh-Hunt
Commander R.N.
Jeremy Lloyd
The Midshipman/Dewberry
Dinsdale Landen
The Midshipman/Bowles
Michael Bentine
Psychologist
Rodney Bewes
Recruitment Interviewee (uncredited)
Dirk Bogarde
Dr. Simon Sparrow (uncredited)
Graham Crowden
Naval Officer (uncredited)
Andrew Sachs
Short-Changed US Seaman
Guy Standeven
American Naval Officer (uncredited)
Richard Vernon
Government Official at Enquiry (uncredited)
David Warner
Sailor Painting Ship (uncredited)
John Phillips
Rear Admiral
Paul Maxwell
Commander Spelling U.S.N.
Nicholas Stuart
Captain Hurley U.S.N.
Sean Kelly
Simpson
John Barrard
Consul
Marie France Dousset
Françoise
Michael Kilgarriff
Claude
Lally Bowers
Mrs. Dewberry
Arthur Lovegrove
C.P.O. Froud
Peter Brace
Leather Jacket Rebel (uncredited)
Robert Cawdron
Marcel's Bar Patron (uncredited)
Bill Hibbert
Revolutionary (uncredited)
Ian Selby
Shocked Man in Cafe (uncredited)
