Lt. Cmdr. Robert Badger

Kenneth More

Vice Admiral Ryan

Lloyd Nolan

Commander Spelling U.S.N.

Paul Maxwell

Captain Hurley U.S.N.

Nicholas Stuart

Simpson

Sean Kelly

Garrett

Alexis Kanner

Williams

Robin Hawdon

Consul

John Barrard

Consul's Wife

Esma Cannon

Orator

Kenneth Griffith

Françoise

Marie France Dousset

Claude

Michael Kilgarriff

Lt. Carol Blair

Joan O'Brien

Bill

Robert Nichols

Sergeant

Neil McCarthy

Corporal

Tutte Lemkow

Mrs. Dewberry

Lally Bowers

Admiral Blake

Laurence Naismith

Admiral Filmer

Andrew Cruickshank

Admiral Thomas

Walter Fitzgerald

Commander R.N.

Ronald Leigh-Hunt

C.P.O. Froud

Arthur Lovegrove

The Midshipman/Dewberry

Jeremy Lloyd

Carson

Derek Fowlds

The Midshipman/Bowles

Dinsdale Landen

Psychologist

Michael Bentine

Recruitment Interviewee (uncredited)

Rodney Bewes

Dr. Simon Sparrow (uncredited)

Dirk Bogarde

Leather Jacket Rebel (uncredited)

Peter Brace

Marcel's Bar Patron (uncredited)

Robert Cawdron

Naval Officer (uncredited)

Graham Crowden

Revolutionary (uncredited)

Bill Hibbert

Short-Changed US Seaman

Andrew Sachs

Shocked Man in Cafe (uncredited)

Ian Selby

George Dewberry Sr.

John Le Mesurier

American Naval Officer (uncredited)

Guy Standeven

Government Official at Enquiry (uncredited)

Richard Vernon

Sailor Painting Ship (uncredited)

David Warner

Rear Admiral

John Phillips

Petty Officer Gilors

Brian Wilde

'Honest' Marcel

Warren Mitchell

Dartmouth Girl

Wanda Ventham

Dance Instructor

Sid James

Colonel & President

Mischa Auer

Director

Wendy Toye

Screenplay

Howard Dimsdale

Novel

John Winton