This movie is the first of a trilogy that Sebastián D'Arbó, a specialist in parapsychology, filmed on occult topics. The second film is El ser (1982) and the last one Más allá de la muerte (1986).
| Directing | Sebastià d'Arbó | Director |
| Writing | Sebastià d'Arbó | Screenplay |
| Writing | Jean Daniela Colbor | Screenplay |
| Sound | José Espeita | Music |
| Camera | Fernando Cobo | Director of Photography |
| Editing | Josep Maria Aragonés | Editor |
| Editing | Sebastià d'Arbó | Editor |
| Art | Pere Daussà | Set Decoration |
| Costume & Make-Up | Josep Massagué | Costume Design |
| Costume & Make-Up | Joana Martí | Makeup Artist |
