Cast & crew
The Relentless Four (1965)
Directed by Primo Zeglio Written by Primo Zeglio, Marcello Fondato, Federico De Urrutia, Manuel Marcello De Caso, Manuel Sebares
Cast
| Giovanni Petti | (uncredited) |
| Claudio Ruffini | (uncredited) |
| Paola Barbara | Lucy |
| Fernando Bilbao | Max Kellerman |
| Howard Ross | Alan Troy |
| José Jaspe | Implacable |
| Luis Induni | Luke |
| Jaime Blanch | Bobi |
| José Canalejas | Calhoun |
| Elisa Mainardi | Nancy Taylor |
| Lorenzo Robledo | Comisario |
| Cris Huerta | Vince Desjardins |
| Giovanni Cianfriglia | (uncredited) |
| Dina Loy | Lucy |
| John Bartha | John Rambo |
| Adam West | Sam |
| Francisco Sanz | Doctor |
| Yelena Samarina | John Rambo |
| Roberto Camardiel | Anders |
| Raf Baldassarre | Anaugh Moss |
| Claudio Undari | Lobo |
Crew
| Franco Pisano | Original Music Composer |
| Marcello Giombini | Original Music Composer |
| Miguel Fernández Mila | Director of Photography |
| Gaetano Valle | Camera Operator |
| Primo Zeglio | Screenplay |
| Marcello Fondato | Screenplay |
| Federico De Urrutia | Screenplay |
| Primo Zeglio | Story |
| Adriano Merkel | Producer |
| Ricardo Sanz | Executive Producer |
| Manuel Marcello De Caso | Screenplay |
| Manuel Sebares | Screenplay |
| Daniele Alabiso | Editor |
| Primo Zeglio | Director |