Dr. Forti carries out strange experiments, assisted by his son Pablo. They embark on an expedition to the jungle. Eight years later Forti returns without his son but strange things start to happen in the old house where they live.
| Actor | Role |
|---|---|
 Carlos VillaríasDr. Galdino Forti | Dr. Galdino Forti |
 Beatriz RamosAngelica | Angelica |
| NNatalia OrtizDona Ingracia | Dona Ingracia |
 Manuel NoriegaJusto | Justo |
 Joaquín BusquetsPablo Forti | Pablo Forti |
 René CardonaLuis Montes | Luis Montes |
 Miguel ArenasDr, Julio Montes | Dr, Julio Montes |
| AAbraham GalánCresencio | Cresencio |
| JJosé CortésIndio Viejo | Indio Viejo |
| CCarlos AganzaIndio joven | Indio joven |
 Julio VillarrealNot listed | Not listed |