Alec Guinness as Captain William Horatio Ambrose

Harry Locke as Reporter

Frederick Piper as Barman

Fred Griffiths as Bus Driver

Gerald Case as Commander

William Mervyn as Captain

John Horsley as First Surgeon

Derek Waring as Second Surgeon

Donald Pleasence as Cashier

Newton Blick as Bank Manager

Irene Browne as Mrs. Barrington

Percy Herbert as Tommy

Victor Maddern as Figg

Harold Goodwin as Duckworth

Junia Crawford as Evie

Warren Mitchell as Artie White

Frank Burdett as Bald Man

Maurice Denham as Crowley

Lloyd Lamble as Superintendent Browning

Martyn Woodman as Reggie

Donald Churchill as Roy

Mike Morgan as Larry

Max Butterfield as Phil

Jackie Collins as June

Susan Gibson as Sheila

Diana Chesney as Mrs. Figg

Miles Malleson as Angler

Allan Cuthbertson as Chailey

Charles Lloyd Pack as Tritton

Lionel Jeffries as Garrod

George Rose as Bullen

Richard Wattis as Registrar of Shipping

Eric Pohlmann as Liberamanian Consul

Charles Cullum as Maj. Kent

Joan Hickson as Mrs. Kent

Alexander Harris as Adrian

Sam Kydd as Frogman

Toke Townley as Timmins

Elsie Wagstaff as Mrs. Gray

Anthony Sagar as Coxswain