Parasite is a 1982 horror/science fiction film starring Demi Moore in her first major film role.
In the far future, an atomic disaster has reduced the world to poverty. Instead of a government, America is run by an organization called the Merchants, who exploit the degenerate remains of society. In order to keep control of the populace, the Merchants force Dr. Paul Dean (Robert Glaudini) to create a new life form, a parasite that feeds on its host. Realizing the deadly potential of such a being, Dean escapes the Merchants with the parasite, infecting himself in the process. Now on the run, he travels from town to town, studying the parasite so that he can find a way to destroy it, all the while keeping one step ahead of a Merchant named Wolf (James Davidson) who is hunting for him. While resting in a desert town, he is attacked by a gang of hooligans (Cherie Currie, Freddy Moore, Natalie May, Joanelle Romero, Tom Villard) led by Ricus (Luca Bercovici), a former slave of the Merchants. The gang steals the parasite, not realizing what it is, and it infects one of the members. Meanwhile, Paul befriends a pretty young lemon grower named Patricia Wells (Demi Moore), who promises to help