Directed by
| Jaime Salvador | ||
Writing Credits (in alphabetical order)
| Ramón Obón | ... | (writer) |
| Adolfo Torres Portillo | ... | (writer) |
Cast (in credits order)
| John Carradine | ... | Dr. Halback | |
| Regina Torné | ... | DiNora Jekyll | |
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Miguel Ángel Álvarez | ... | Sir Fredrick Halback (as Miguel Angel Alvarez) |
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Guillermo Zetina | ... | Doyle |
| Andrés García | ... | Dr. Alfonso Bennett (as Andres Garcia) | |
| Isela Vega | ... | Ballerina | |
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Gloria Munguía | ... | Melina Jackson (as Gloria Munguia) |
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Ángel Di Stefani | ... | (as Angel Distefani) |
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Laura Ferlo | ||
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Sílvia Villalobos | ... | First Subject |
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Queta Carrasco | ... | (as Enriqueta Carrasco) |
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Jose Antonio Garcia | ||
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Carlos Suárez | ||
Produced by
| Jorge García Besné | ... | executive producer |
| Luis Enrique Vergara | ... | producer |
Music by
| Gustavo César Carrión | ||
Cinematography by
| Alfredo Uribe | ||
Editing by
| José Juan Munguía | ||
Art Direction by
| José Méndez | ||
| Octavio Ocampo | ||