Directed by
| Donald Taylor | ||
Writing Credits (in alphabetical order)
| George Fass | ||
| Gertrude Fass | ||
| Martin A. Gosch | ||
| Elizabeth Shenkin | ... | (story) |
| Ernest Shenkin | ... | (story) |
Cast (in credits order)
| Rubén Rojo | ... | Dr. Miguel Valdés | |
| Fernando Rey | ... | Inspector Alfonso Martínez | |
 |
Nina Karell | ... | Margot |
| Rolf Wanka | ... | Dr. Reynar | |
| Elena Barrios | ... | Teresa Montero | |
| Julio Peña | ... | Carlos | |
| Fernando Sancho | ... | Pedro | |
| Adriano Domínguez | ... | Luis | |
| Rest of cast listed alphabetically: | |||
| Luana Alcañiz | |||
|
|
Manuel Aparicio | ||
|
|
Mike Brendel | ||
|
|
Carmen Carulla | ||
|
|
Geoffrey Clay | ||
| Peter Kern | |||
|
|
Noberto Kerner | ||
|
|
Julián Ugarte | ||
| Laura Valenzuela | |||
|
|
Fernando Villena | ||
Music by
| Leo Arnaud | ||
Cinematography by
| Manuel Berenguer | ||
Editing by
| Jack Bygrave | ||
| Magdalena Pulido | ||
Set Decoration by
| Francisco Prósper | ||
| Luis Pérez Espinosa | ... | (as Luis Perez Espinosa) |
Additional Crew
| Julio F. Alymán | ... | voice dubbing (uncredited) |
| Rafael Arcos | ... | voice dubbing (uncredited) |
| Salvador Arias | ... | voice dubbing (uncredited) |
| José Luis Baltanás | ... | voice dubbing (uncredited) |
| Rafael Calvo Revilla | ... | voice dubbing (uncredited) |
| Eduardo Calvo | ... | voice dubbing (uncredited) |
| Pilar Calvo | ... | voice dubbing (uncredited) |
| José María Cordero | ... | voice dubbing: Fernando Sancho (uncredited) |
| Rafael de Penagos | ... | voice dubbing (uncredited) |
| Julio Goróstegui | ... | voice dubbing (uncredited) |
| Manuel Gómez | ... | voice dubbing (uncredited) |
| Luis María Lasala | ... | voice dubbing (uncredited) |
| Mercedes Mireya | ... | voice dubbing (uncredited) |
| Carmen Morando | ... | voice dubbing: Nina Karell (uncredited) |
| Fernando Nogueras | ... | voice dubbing (uncredited) |
| Santos Paniagua | ... | voice dubbing (uncredited) |
| José Luis Pecker | ... | voice dubbing (uncredited) |
| José María Prada | ... | voice dubbing (uncredited) |
| Carlos Revilla | ... | voice dubbing (uncredited) |
| Ana María Saizar | ... | voice dubbing (uncredited) |
| Francisco Sánchez | ... | voice dubbing: Rolf Wanka (uncredited) |
