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After the long career of lawman that made him a legend, Wyatt Earp deciedes to quit and join his brothers in Tombstone, Arizona. There he would see them in feud with Clantons, local clan of thugs and cattle thieves. When the showdown becomes inevitable, the help will come from Doc Holliday, terminally-ill gambler who happens to be another Wild West legend.

The director José Mojica Marins travels to spend Christmas with friends in the small farm where they live and write the story of his next film. However, he observes eerie things in the house, with his friends being possessed one by one by some supernatural evil force. Sooner he learns that the matriarch of the family had made a deal with a local witch Malvina to get pregnant and save her marriage. In return, Malvina should indicate who would marry the girl. However, her daughter Wilma is engaged of her beloved fiancé and Malvina wants her to get married with Eugenio, who is the son of Satan. Further, José Mojica Marins discovers that his fictional creation Zé do Caixão (a.k.a. Coffin Joe) is ready to collect the souls of Wilma's family and only and exorcism may save the doomed family.

During a debate of journalists with the renowned psychiatrist Dr. Sérgio and José Mojica Marins a.k.a. Zé do Caixão, Sr. Sérgio presents several cases of kinky sex and orgy associated to the use of drugs. The journalists defend that the cases are related to perverts and criminals, but Dr. Sérgio blames the influence of drugs for the violence. Then Dr. Sérgio invites four persons from different classes to use LSD and analyze the effect of Zé do Caixão's films in their twisted minds to prove his theory.