Cmdr. Max Easton

James Mason

Sir Charles Holland

George Sanders

Virginia Killain

Vera Miles

Minister

Oliver Johnston

Commander John Larkin

Robert Flemyng

Tom

William Kendall

1st Special Branch man Gregson

Duncan Lamont

Capt. Graham

Harry Andrews

2nd Special Branch Man Jones (uncredited)

Gordon Harris

Sub Lt. Brown

Peter Barkworth

Clara Holland

Rachel Gurney

John Holland

Martin Stephens

Marcia Holland

Waveney Lee

Robert Holland

Charles Carson

Susan

Junia Crawford

Club Member (as Henry Longhurst)

Henry B. Longhurst

Club Member

Roger Maxwell

Club Member

Gerald Case

Club Member

Donald Bisset

Commander Bates

Ernest Clark

Club Member

Desmond Roberts

Club Steward

Reginald Smith

WREN Officer

Rosemary Dorken

Jason Parrish (as Macdonald Parke)

MacDonald Parke

Adele Parrish

Mavis Villiers

Local Doctor (uncredited)

Alexander Archdale

Tom

Victor Kendall

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

Basil Dignam

Percy Herbert

Nightclub Patron (uncredited)

Mabel Etherington

Miss Price (uncredited)

Barbara Hicks

1st Editor (uncredited)

John Horsley

Club Member (uncredited)

Frederick Kelsey

Head of the Admiralty (uncredited)

John Le Mesurier

2nd Editor (uncredited)

Ronald Leigh-Hunt

Russian Officer Cornered by Max Easton (uncredited)

Richard Marner

Capt. Balfour (uncredited)

William Mervyn

2nd Russian Officer (uncredited)

Andre Mikhelson

American General at Embassy Party (uncredited)

John More

2nd Policeman (uncredited)

Dickie Owen

Hall Porter (uncredited)

Frederick Piper

Nightclub Patron (uncredited)

Pat Ryan

1st Russian Officer (uncredited)

Stanley Zevic