Roger Moore as Otto Hecht

Telly Savalas as Zeno

David Niven as Professor Blake

Stefanie Powers as Dottie Del Mar

Claudia Cardinale as Eleana

Richard Roundtree as Nat Judson

Sonny Bono as Bruno Rotelli

Elliott Gould as Charlie

Anthony Valentine as Volkmann

Siegfried Rauch as Braun

Michael Sheard as Sergeant Mann

Richard Wren as Reistoffer

Philip Locke as Vogel

Steve Ubels as Lantz

Paul Picerni as Zeno's Man

Paul Stassino as Zeno's Man

Manolis Peletis as

Stassia Stakis as

Lykourgos Kallergis as

Lambros Tsangas as

Mimi Denissi as

Anne Marie Sten as

Mary Dracopoulou as

Elena Secota as

Vanna Reville as

William Holden as POW (uncredited)