James Mason

Cmdr. Max Easton

George Sanders

Sir Charles Holland

Vera Miles

Virginia Killain

Robert Flemyng

Cmdr. John Larkin

Oliver Johnston

Minister

William Kendall

Tom

Duncan Lamont

1st Special Branch man Gregson

Harry Andrews

Capt. Graham

Peter Barkworth

Sub Lt. Brown

Rachel Gurney

Clara Holland

Martin Stephens

John Holland

Waveney Lee

Marcia Holland

Charles Carson

Robert Holland

Junia Crawford

Susan

Henry B. Longhurst

Club Member (as Henry Longhurst)

Roger Maxwell

Club Member

Gerald Case

Club Member

Donald Bisset

Club Member

Desmond Roberts

Club Member

Reginald Smith

Club Steward

Rosemary Dorken

WREN Officer

MacDonald Parke

Jason Parrish (as Macdonald Parke)

Mavis Villiers

Adele Parrish

Ernest Clark

Cmdr. Bates

Alexander Archdale

Local Doctor (uncredited)

Basil Dignam

Lt. Cmdr. Evans at P.R.O. (uncredited)

Mabel Etherington

Nightclub Patron (uncredited)

Gordon Harris

2nd Special Branch Man Jones (uncredited)

Barbara Hicks

Miss Price (uncredited)

John Horsley

1st Editor (uncredited)

Frederick Kelsey

Club Member (uncredited)

John Le Mesurier

Head of the Admiralty (uncredited)

Ronald Leigh-Hunt

2nd Editor (uncredited)

Richard Marner

Russian Officer Cornered by Max Easton (uncredited)

William Mervyn

Capt. Balfour (uncredited)

Andre Mikhelson

2nd Russian Officer (uncredited)

John More

American General at Embassy Party (uncredited)

Dickie Owen

2nd Policeman (uncredited)

Frederick Piper

Hall Porter (uncredited)

Pat Ryan

Nightclub Patron (uncredited)

Stanley Zevic

1st Russian Officer (uncredited)