Roger Moore

Otto Hecht

Acting

Telly Savalas

Zeno

Acting

David Niven

Professor Blake

Acting

Stefanie Powers

Dottie Del Mar

Acting

Claudia Cardinale

Eleana

Acting

Richard Roundtree

Nat Judson

Acting

Sonny Bono

Bruno Rotelli

Acting

Elliott Gould

Charlie

Acting

Anthony Valentine

Volkmann

Acting

Siegfried Rauch

Braun

Acting

Michael Sheard

Sergeant Mann

Acting

Richard Wren

Reistoffer

Acting

Philip Locke

Vogel

Acting

Steve Ubels

Lantz

Acting

Paul Picerni

Zeno's Man

Acting

Paul Stassino

Zeno's Man

Acting

Manolis Peletis

Acting

Stassia Stakis

Acting

Lykourgos Kallergis

Acting

Lambros Tsangas

Acting

Mimi Denissi

Acting

Anne Marie Sten

Acting

Mary Dracopoulou

Acting

Elena Secota

Acting

Vanna Reville

Acting

William Holden

POW (uncredited)

Acting