Emile Robert, a music-hall artist in his sixties, receives a message from Uruguay from a certain Alfredo Quiroga. He says to be the brother of Eurídice, a young intern with whom he had a passionate love story in the 70s. Emile travels to Montevideo in search of the past, where Alfredo lends him the family apartment.

A cruel circus owner beats and abuses his pregnant wife. One day the circus receives a leopard newly captured in Africa, but the animal soon dies. However, an evil creature that was inside the leopard bursts out of the animal's body, burrows into the wife's body and takes over her fetus. It soon starts demanding blood, and the woman goes searching for victims for her new "baby."

Grotesque and artless, this repugnant sexploitation film is about two unbalanced brothers who try to force an itinerant bum to rape their mother, and then all three men go after the promiscuous woman who lives next door. When it is revealed that the homeless man is none other than the father of the two brothers, the plot slides even further downhill.