Professional killer Holland is forced out of retirement to break a Central American government's political torture ring when one of his friends, a Latin American journalist, is killed. The murderer, Doctor Clement Molloch, is the master sadist behind the political torture of innocent victims. Posing as a journalist, Holland lures Molloch out of his fortress-like headquarters by using his murdered friend's wife and daughter as bait. When Holland kidnaps Molloch's sister, the doctor is led on a wild chase that takes him to an abandoned opal mine where he finally comes face to face with Holland.
| Directing | J. Lee Thompson | Director |
| Sound | Ken Thorne | Original Music Composer |
| Production | Pancho Kohner | Producer |
| Camera | Xavier Cruz | Director of Photography |
| Editing | Peter Lee-Thompson | Editor |
| Writing | R. Lance Hill | Screenplay |
| Production | Jill Ireland | Associate Producer |
| Production | David Pringle | Associate Producer |
| Writing | John Crowther | Screenplay |
| Production | Lance Hool | Executive Producer |
| Costume & Make-Up | Poppy Cannon-Reese | Costume Design |
| Art | Enrique Estévez | Art Direction |
| Crew | Ernie F. Orsatti | Stunt Coordinator |
| Directing | Ernie F. Orsatti | Second Unit Director |
| Costume & Make-Up | Alan Marshall | Makeup Artist |
| Costume & Make-Up | Ester Oropeza | Assistant Makeup Artist |
| Costume & Make-Up | Esperanza Gómez | Hairstylist |
| Art | Antonio Mata | Property Master |
| Sound | Roberto Camacho | Sound Mixer |
| Sound | Joseph Holsen | Sound Editor |
| Sound | Michael Minkler | Sound Re-Recording Mixer |
| Sound | John Post | Sound Editor |
| Sound | Michael P. Redbourn | Sound Editor |
| Sound | Richard Shorr | Sound Editor |
| Sound | Martha Burns Holsen | Sound Editor |
| Crew | Laurencio Cordero | Special Effects |
| Costume & Make-Up | Enedina Bernal | Wardrobe Designer |
| Sound | Stephen A. Hope | Music Editor |
| Sound | Ken Thorne | Conductor |
| Crew | Ken Fritz | Stunts |
| Writing | R. Lance Hill | Novel |
