The plane of a military man falls in an isolated area of the forest and, in time, he becomes a man-beast, a troglodyte. He is found by a scientist who turns him into a guinea pig for an experimental potion. The experiment fails and the troglodyte becomes a satyr who attacks and kidnaps maidens to take them to a cave where he subjects them to atrocities.
| Actor | Role |
|---|---|
| SSaverio YaquintoCapitán Richard, el hombre bestia | Capitán Richard, el hombre bestia |
| CCarmen QuirogaEsther | Esther |
| RRaúl D'AngeliDr. Marchesi | Dr. Marchesi |
 Lito BayardoAlberto | Alberto |
| EElvira RattiEnriqueta | Enriqueta |
| FFelipe SalzingerProfesor Robinson | Profesor Robinson |
| RRosarito OlmedoSusana | Susana |
| BBeatriz ColmanMargarita | Margarita |
| GGastón RobertDon Nicolás Santillán | Don Nicolás Santillán |
| RRicardo BattagliaProfesor Berard | Profesor Berard |
| MMario CuartucciDetective Jackson | Detective Jackson |
| BB. FilippelliPescador | Pescador |