David Knight as Ted Hutchens

Odile Versois as Anna Szobek

Theodore Bikel as Joseph

David Kossoff as Geza Szobek

Joseph Tomelty as Moffatt

Paul Carpenter as Gregg Pearson

Peter Illing as Dr. Weissbrod

John McLaren as Col. Margetson

Bernard Rebel as Stefan

Jill Adams as Judy (uncredited)

Robin Bailey as Thomas Cook cashier (uncredited)

Dora Bryan as Switchboard Operator (uncredited)

Peter Dyneley as Regan (uncredited)

Dwight D. Eisenhower as Himself, in photo (uncredited)

Percy Herbert as Richards (uncredited)

Sam Kydd as Driver, Embassy car JAK711 (uncredited)

Victor Maddern as Sailor (uncredited)

Betty Marsden as Mrs. Forrester (uncredited)

Aubrey Mather as Waiter (uncredited)

Joan Sims as Telephone Operator, American Embassy (uncredited)

Russell Waters as Counterman (uncredited)