Leon Alastray is an outlaw who has been given sanctuary by Father John, whom he then escorts to the village of San Sebastian. The village is deserted, with its cowardly residents hiding in the hills from Indians, who regularly attack the village and steal all their supplies. When Father John is murdered, the villagers mistakenly think the outlaw is the priest. Alastray at first tells them he is not a priest, but they don't believe it, and an apparent miracle seems to prove they are correct. Eventually, he assists them in regaining their confidence and defending themselves.
Unfortunately the movie Guns for San Sebastian is not yet available on HBO Max.
| Writing | James R. Webb | Screenplay |
| Directing | Henri Verneuil | Director |
| Writing | William Barby Faherty | Novel |
| Writing | Miguel Morayta | Writer |
| Writing | Ennio De Concini | Writer |
| Writing | Serge Gance | Screenplay |
| Art | Roberto Silva | Art Direction |
| Costume & Make-Up | Yvonne Wood | Costume Design |
| Production | Ernesto Enríquez | Associate Producer |
| Art | Robert Clavel | Art Direction |
| Production | Jacques Bar | Producer |
| Editing | Françoise Bonnot | Editor |
| Camera | Armand Thirard | Director of Photography |
| Sound | Ennio Morricone | Music |
