 | David Janssen als Lester Horton |
 | Arthur Kennedy als CIA Chief of Station, Athens |
 | Maurizio Merli als John Florio |
 | Corinne Cléry als Anne Florio |
 | Ivan Rassimov als The Silent |
 | Giacomo Rossi Stuart als Grant |
 | Philippe Leroy als Greek Inspector |
| Romolo Guerrieri | Director |
| Stelvio Cipriani | Original Music Composer |
| Franco Caruso | Line Producer |
| Enzo Silvestri | Executive Producer |
| Giuseppe Tortorella | Executive Producer |
| Gianbattista Milesi | Producer |
| Michele Germano | Production Manager |
| Vittorio Schiraldi | Story |
| Vittorio Schiraldi | Screenplay |
| Nico Ducci | Screenplay |
| Romolo Guerrieri | Screenplay |
| Mino Roli | Screenplay |
| Eugenio Liverani | Production Design |
| Antonio Siciliano | Editor |
| Erico Menczer | Director of Photography |
