Roger Moore

Otto Hecht

Telly Savalas

Zeno

David Niven

Professor Blake

Stefanie Powers

Dottie Del Mar

Claudia Cardinale

Eleana

Richard Roundtree

Nat Judson

Sonny Bono

Bruno Rotelli

Elliott Gould

Charlie

Anthony Valentine

Volkmann

Siegfried Rauch

Braun

Michael Sheard

Sergeant Mann

Richard Wren

Reistoffer

Philip Locke

Vogel

Steve Ubels

Lantz

Paul Picerni

Zeno's Man

Paul Stassino

Zeno's Man

Manolis Peletis

Stassia Stakis

Lykourgos Kallergis

Lambros Tsangas

Mimi Denissi

Anne Marie Sten

Mary Dracopoulou

Elena Secota

Vanna Reville

William Holden

POW (uncredited)