Directed by
| Jack Hill | ... | (US scenes) |
| Juan Ibáñez | ... | (Mexican scenes) |
| José Luis González de León | ... | (co-director) |
Writing Credits (in alphabetical order)
| Juan Ibáñez | ||
| Karl Schanzer | ||
| Luis Enrique Vergara | ... | (as L.E. Vergara C.) |
Cast (in credits order) complete, awaiting verification
| Boris Karloff | ... | Prof. John Mayer | |
| Enrique Guzmán | ... | Dr. Paul Rosten | |
| Christa Linder | ... | Laura | |
| Maura Monti | ... | Dr. Isabel Reed | |
| Yerye Beirute | ... | Thomas | |
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Tere Vales | ... | Nancy (as Tere Valez) |
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Griselda Mejía | ... | Prostitute |
| Sergio Kleiner | ... | Alien | |
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Rosángela Balbó | ... | Martha - mayor's wife |
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Mariela Flores | ... | Deaf-mute victim |
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Tito Novaro | ... | Gen. Nord |
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Sergio Virel | ... | Villager |
| Nathanael León | ... | Villager (as Frankestein) | |
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Víctor Jordán | ... | (as Victor Jordan) |
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Julián de Meriche | ... | Visiting dignitary |
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Carlos León | ... | Villager |
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Arturo Fernández | ||
| Rest of cast listed alphabetically: | |||
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Victorio Blanco | ... | Old Villager Carrying Cross (uncredited) |
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Ángel Di Stefani | ... | Visitor (uncredited) |
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Jorge Fegán | ... | Officer (uncredited) |
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Patricia de Morelos | ... | Villager (uncredited) |
Produced by
| Luis Enrique Vergara | ... | producer (as Luis Enrique Vergara C.) |
Music by
| Enrico C. Cabiati | ... | (as Enrico Cabiatti) |
Cinematography by
| Raúl Domínguez | ||
| Austin McKinney | ||
Editing by
| Raul J. Casso | ... | (as Raul Caso) |
Art Direction by
| José Méndez | ||
| Octavio Ocampo | ||
Set Decoration by
| Raúl Cárdenas | ||
Costume Design by
| Vicente Tostado | ... | (as Tostado) |
Makeup Department
| Maria Elena Ortiz | ... | hair stylist |
| Antonio Ramirez | ... | makeup artist (as Tony Ramirez) |
Production Management
| José Luis Cerrada | ... | production manager |
Sound Department
| Guillermo Carrasco | ... | sound recordist |
| Heinrich Henkel | ... | re-recording mixer / sound recordist |
| Víctor Rojo | ... | dialogue recordist |
| Ricardo Saldívar | ... | sound recordist |
Special Effects by
| Enrique Gordillo | ... | special effects |
| James M. Tanenbaum | ... | special high voltage effects (uncredited) |
Camera and Electrical Department
| Ciro | ... | still photographer |
| Rubén Mendoza | ... | assistant camera |
| Eduardo Rojo | ... | camera operator |
Costume and Wardrobe Department
| Richard Bruno | ... | wardrobe |
Editorial Department
| Ángel Camacho | ... | assistant editor (as Angel Camacho) |
| Pedro Gómez | ... | assistant editor (as Pedro Gomez) |
| Lilia Lupercio | ... | negative cutter |
Script and Continuity Department
| Miguel Garzon | ... | continuity |
Additional Crew
| Raul G. Manjarrez | ... | delegate: actors |
| Guillermo Olivera | ... | production coordinator |
| Stillman Segar | ... | dialogue director (as Stim Segar) |