David Knight

Character: Ted Hutchens

Odile Versois

Character: Anna Szobek

Theodore Bikel

Character: Joseph

David Kossoff

Character: Geza Szobek

Joseph Tomelty

Character: Moffatt

Paul Carpenter

Character: Gregg Pearson

Peter Illing

Character: Dr. Weissbrod

John McLaren

Character: Col. Margetson

Bernard Rebel

Character: Stefan

Jill Adams

Character: Judy (uncredited)

Robin Bailey

Character: Thomas Cook cashier (uncredited)

Dora Bryan

Character: Switchboard Operator (uncredited)

Peter Dyneley

Character: Regan (uncredited)

Dwight D. Eisenhower

Character: Himself, in photo (uncredited)

Percy Herbert

Character: Richards (uncredited)

Sam Kydd

Character: Driver, Embassy car JAK711 (uncredited)

Victor Maddern

Character: Sailor (uncredited)

Betty Marsden

Character: Mrs. Forrester (uncredited)

Aubrey Mather

Character: Waiter (uncredited)

Joan Sims

Character: Telephone Operator, American Embassy (uncredited)

Russell Waters

Character: Counterman (uncredited)