Een Amerikaanse moeder gaat op zoek naar haar dochter. Ze is ontvoerd door mensenhandelaars in El Salvador, de moordhoofdstad van de wereld. Haar zoektocht voert haar door Midden-Amerika en Mexico via "De Trein des Doods".
Nee, helaas is Relentless nog niet beschikbaar op Netflix in Nederland.
| Camera | Michael Solidum | Director of Photography |
| Production | Ricki Maslar | Casting |
| Art | Ana Carolina Montagnana | Production Design |
| Lighting | Ardy Fatehi | Gaffer |
| Art | Daryl Hoss | Art Direction |
| Crew | Daryl Hoss | Special Effects |
| Visual Effects | J.D. McKee | Visual Effects Supervisor |
| Costume & Make-Up | Juliette Lunger | Costume Design |
| Production | Santiago Gutierrez | Executive Producer |
| Sound | Aaron Gilhuis | Music |
| Editing | Lance Tracy | Editor |
| Production | Alec Garcia | Executive Producer |
| Production | Carlos A. Figueroa | Executive Producer |
| Production | Jon Hollis | Line Producer |
| Directing | Lance Tracy | Director |
| Writing | Lance Tracy | Writer |
| Production | Andre R. Guttfreund | Executive Producer |
| Production | Jorge Dalton | Executive Producer |
| Production | Michelle Glenn Julian | Producer |
| Production | Anton Nadler | Producer |
| Production | Steven Leslie Johnson | Executive Producer |
| Camera | Akis Konstantakopoulos | Additional Photography |
