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).
Los embarazados
The film depicts ten years of Catalan history, from 1899 with the defeat of the Spanish side in the Cuban War of Independence to the Tragic Week 1909.