Michael Caine as Maj. John Tarrant

Donald Pleasence as Cedric Harper

Delphine Seyrig as Ceil Burrows

Clive Revill as Alf Chestermann

John Vernon as McKee

Joss Ackland as Chief Supt. Wray

Janet Suzman as Alex Tarrant

Catherine Schell as Lady Melissa Julyan

Joseph O'Conor as Sir Edward Julyan

Denis Quilley as Bateson

Derek Newark as Monitoring Policeman

Edward Hardwicke as Mike McCarthy

Maureen Pryor as Jane Harper

Joyce Carey as Miss Monley

Preston Lockwood as Ilkeston

Molly Urquhart as Margaret

David Daker as MI5 Man

Hermione Baddeley as Hetty

Patrick Barr as Gen. St. John

Yves Afonso as Jacques (uncredited)

Del Baker as Shadow (uncredited)

Murray Brown as Doctor (uncredited)

Les Conrad as M15 Man (uncredited)

George Lane Cooper as Pincus (uncredited)

Brenda Cowling as Secretary (uncredited)

Robert Dorning as Jeweller (uncredited)

Roy Everson as M15 Man (uncredited)

Nancy Gabrielle as Manageress (uncredited)

Jill Goldston as Commuter (uncredited)

Charlie Gray as Tourist (uncredited)

Peter Halliday as Customs Officer (uncredited)