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