Oliver Reed
Role: Ivan Dragomiloff
Diana Rigg
Role: Sonya Winter
Telly Savalas
Role: Lord Bostwick
Curd Jürgens
Role: General von Pinck
Philippe Noiret
Role: Monsieur Lucoville
Warren Mitchell
Role: Herr Weiss
Beryl Reid
Role: Madame Otero
Clive Revill
Role: Cesare Spado
Kenneth Griffith
Role: Monsieur Popescu
Vernon Dobtcheff
Role: Baron Muntzof
Annabella Incontrera
Role: Eleanora Spado
George Coulouris
Role: Swiss Peasant
Ralph Michael
Role: Editor
Katherine Kath
Role: Mme. Lucoville
Eugene Deckers
Role: 'La Belle Amie' desk clerk
Olaf Pooley
Role: Swiss Cashier
George Murcell
Role: Zeppelin pilot
Michael Wolf
Role: Zeppelin officer
Gordon Sterne
Role: Corporal
Peter Bowles
Role: Jealous lover at 'La Belle Amie' (uncredited)
William Kendall
Role: M. Marivaux at 'La Belle Amie'
Jeremy Lloyd
Role: English Officer
Roger Delgado
Role: Bureau Member (uncredited)
Maurice Browning
Role: Bureau Member
Clive Cazes
Role: Bureau Member
Milton Reid
Role: Circus victim Leonardi
Frank Thornton
Role: Elevator victim (uncredited)
Nita Lorraine
Role: 'La Belle Amie' Girl
Michael Mellinger
Role: Venetian Police Officer (uncredited)
Philip Madoc
Role: German Officer
Kevin Stoney
Role: Blind Man
Lockwood West
Role: Hatter
Rosalind Elliot
Role: Blind hatmaker (Uncredited)
John Abineri
Role: Police Inspector (uncredited)
Anthony Dawes
Role: Assistant Editor (uncredited)
Harry Fielder
Role: Soldier (uncredited)
Michael Gover
Role: Venice Hotel Manager (uncredited)
Peter Graves
Role: Dragomiloff's Butler (uncredited)
John Hallam
Role: Bureau Member (uncredited)
John G. Heller
Role: von Pinck's Aide (uncredited)
Alastair Hunter
Role: Exp!oding Casket Victim (uncredited)