Norman Wisdom as Ordinary Seaman Norman Puckle

Ian Hunter as Admiral Sir Bryanston Blyth

David Lodge as Chief Petty Officer Knowles

Robert Urquhart as Commander Clayton

Edward Chapman as Mr. Philpots

Eddie Byrne as Petty Officer Filkins

Peter Jones as Diving Instructor

John Le Mesurier as Prosecuting Counsel

Terence Alexander as Defending Counsel

Sydney Tafler as Speedboat Owner

Brian Oulton as Bert Ainsworth

Harold Goodwin as Streaky Hopkinson

Johnny Briggs as Johnny Nolan

Frank Williams as Mr. Carruthers

Joe Robinson as Tall Sailor

Liz Fraser as NAAFI Girl

Penny Morrell as Miss Marlene Barlow

Claire Gordon as Blonde on Yacht

Julie Shearing as WRN Smith

Bosun as Bosun the Dog

John Arnatt as Briggs (uncredited)

John Bailey as Prisoner Escort (uncredited)

Alan Beaton as Commander (uncredited)

Michael Caine as Sailor in Cinema Fight (uncredited)

Rodney Cardiff as Sailor (uncredited)

Tony Castleton as Sailor (uncredited)

Cyril Chamberlain as Jimmy (uncredited)

Bill Cummings as Sailor (uncredited)

Roland Curram as Control Room Radio Operator (uncredited)

Larry Dann as New Dalton's Boy (uncredited)

Robert Desmond as Sailor on Bridge of Warship (uncredited)

Vince Fleming as Sailor (uncredited)

Chick Fowles as Man in Cinema Queue (uncredited)

Tex Fuller as Sailor (uncredited)

Sheila Hancock as Doris (uncredited)

Imogen Hassall as Girl in Cinema Queue (uncredited)

Glyn Houston as Gym Instructor (uncredited)

Roy Lansford as Prisoner Escort (uncredited)

Rosamund Lesley as Peggy (uncredited)

Philip Locke as Teddy Boy in Cinema Fight (uncredited)

Keith Peacock as Sailor (uncredited)

Geremy Phillips as Audience Member (uncredited)

Bryan Pringle as Physical Training Instructor (uncredited)

Fred Real as Commander (uncredited)

Oliver Reed as Teddy Boy in Cinema Fight (uncredited)

William Roache as Space Centre Operator (uncredited)

Leonard Sachs as Yachtsman (uncredited)

Anthony Sagar as Instructor's Assistant (uncredited)

Arnold Schulkes as Sailor (uncredited)

Anne Scott as Polynesian Girl (uncredited)

John Tatham as Naval Officer (uncredited)