Robert Vaughn (Bill Fenner)
Elke Sommer (Sandra Fane)
Felicia Farr (Claire Connor)
Karl Heinz Böhm (Robert Wahl)
Ed Asner (Frank Rosenfeld)
Boris Karloff (Dr. Pierre Vaugiroud)
Fabrizio Mioni (Russo)
Wesley Lau (Neill Carlson)
Roger C. Carmel (Mike Ballard)
Luciana Paluzzi (Giulia Almeranti)
Joe de Santis (Jan Aarvan)