Four actors on film are lost from the crew. They are on a boat in the middle of a dam. They land at a strange point, where they meet a tribe of semi-savages and backwards in time. They are imprisoned and learn of the existence of a scientist who was experimenting with human guinea pigs, brain transplants, crossings of humans with animals, etc. there. Pan, half man and half goat, a figure from Greek mythology, is the leader of the band, who hypnotizes everyone with the touch of his flute. He seizes the women and traps the men, making the women of the tribe fight over them.

Marcia, a nymphomaniac girl postpones the marriage with her fiance, Beto, because they have some problems and goes to the family farm with him to have a rest. There, her young and sexy stepmother is attracted to the boy, seduces and sex with him. Meanwhile she reunites with the stable boy, Juka her childhood friend and Ariscu, the horse from her childhood and begins to live sensual moments with the animal with which she had a relationship once.