Oliver Reed as Ivan Dragomiloff

Diana Rigg as Sonya Winter

Telly Savalas as Lord Bostwick

Curd Jürgens as General von Pinck

Philippe Noiret as Monsieur Lucoville

Warren Mitchell as Herr Weiss

Beryl Reid as Madame Otero

Clive Revill as Cesare Spado

Kenneth Griffith as Monsieur Popescu

Vernon Dobtcheff as Baron Muntzof

Annabella Incontrera as Eleanora Spado

Jess Conrad as Angelo

George Coulouris as Swiss Peasant

Ralph Michael as Editor

Katherine Kath as Mme. Lucoville

Eugene Deckers as 'La Belle Amie' desk clerk

Olaf Pooley as Swiss Cashier

George Murcell as Zeppelin pilot

Michael Wolf as Zeppelin officer

Gordon Sterne as Corporal

Peter Bowles as Jealous lover at 'La Belle Amie' (uncredited)

William Kendall as M. Marivaux at 'La Belle Amie'

Jeremy Lloyd as English Officer

Roger Delgado as Bureau Member (uncredited)

Maurice Browning as Bureau Member

Clive Cazes as Bureau Member

Milton Reid as Circus victim Leonardi

Frank Thornton as Elevator victim (uncredited)

Nita Lorraine as 'La Belle Amie' Girl

Michael Mellinger as Venetian Police Officer (uncredited)

Philip Madoc as German Officer

Kevin Stoney as Blind Man

Lockwood West as Hatter

Rosalind Elliot as Blind hatmaker (Uncredited)

John Abineri as Police Inspector (uncredited)

Anthony Dawes as Assistant Editor (uncredited)

Harry Fielder as Soldier (uncredited)

Michael Gover as Venice Hotel Manager (uncredited)

Peter Graves as Dragomiloff's Butler (uncredited)

John Hallam as Bureau Member (uncredited)

John G. Heller as von Pinck's Aide (uncredited)

Alastair Hunter as Exp!oding Casket Victim (uncredited)