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."
A snake-like parasite crawls into the uterus of an abused woman and circus performer named Yanka. The parasite demands human blood from Yanka who is first reluctant, but then finds that the only relationship she has is with the parasite. Yanka commits murders to devour the victims' blood in order to nurture the parasite. The parasite tells her that it is a creature that will replace man as the dominant species on the planet in five million years, and must be released in the ocean. The creature is eventually released in the sea where it abandons Yanka.
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