Santo goes up against a mad scientist and a ranch owner who are turning immigrants into mind controlled zombies.
| Actor | Role |
|---|---|
 El SantoSanto | Santo |
 Miguel Ángel FuentesMonk, capataz | Monk, capataz |
| GGerardo ReyesGerardo | Gerardo |
 Carmen del ValleAzucena | Azucena |
| CCarlos SuárezCarlitos | Carlitos |
| JJean SafontDr. Sombra | Dr. Sombra |
| FFederico FalcónFernando | Fernando |
| SSarita GómezFlorecita (as niña Sarita Gómez) | Florecita (as niña Sarita Gómez) |
| FFernando YapurDr. Sombra | Dr. Sombra |
| CCésar GómezNot listed | Not listed |
| GGuillermo AyalaBracero asesinado | Bracero asesinado |
| AAbel CasillasNot listed | Not listed |
 Oscar RicciNot listed | Not listed |
| GGuillermo InclánNot listed | Not listed |
| LLilia LanduaNot listed | Not listed |
| VVictor Mar ManuelNot listed | Not listed |
| BBobby LeeWrestler | Wrestler |
| RRingo MendozaWrestler | Wrestler |
| ''Karloff' LagardeWrestler | Wrestler |