Cast
Kenneth More
Lt. Cmdr. Robert Badger
John Le Mesurier
George Dewberry Sr.
Paul Maxwell
Commander Spelling U.S.N.
Robin Hawdon
Williams
Andrew Cruickshank
Admiral Filmer
Guy Standeven
American Naval Officer (uncredited)
David Warner
Sailor Painting Ship (uncredited)
Joan O'Brien
Lt. Carol Blair
Robert Nichols
Bill
Neil McCarthy
Sergeant
Dirk Bogarde
Dr. Simon Sparrow (uncredited)
Richard Vernon
Government Official at Enquiry (uncredited)
Lloyd Nolan
Vice Admiral Ryan
Mischa Auer
Colonel & President
Alexis Kanner
Garrett
Ronald Leigh-Hunt
Commander R.N.
Jeremy Lloyd
The Midshipman/Dewberry
Dinsdale Landen
The Midshipman/Bowles
Laurence Naismith
Admiral Blake
Michael Bentine
Psychologist
Graham Crowden
Naval Officer (uncredited)
Andrew Sachs
Short-Changed US Seaman
John Phillips
Rear Admiral
Esma Cannon
Consul's Wife
Tutte Lemkow
Corporal
Walter Fitzgerald
Admiral Thomas
Brian Wilde
Petty Officer Gilors
Warren Mitchell
'Honest' Marcel
Wanda Ventham
Dartmouth Girl
Sidney James
Dance Instructor
Kenneth Griffith
Orator
Derek Fowlds
Carson
Rodney Bewes
Recruitment Interviewee (uncredited)