José Mojica Marins, a director of horror films about the diabolical Coffin Joe, is spending Christmas with friends. Household members go violently mad for no reason: first grandpa, hen the hosts' daughters, one of them, Vilma, is about to get married. Mojica discovers that Vilma's mother made a pact with a witch in order to become pregnant with Vilma, promising this firstborn child to Satan. Her impending marriage to a human is stirring up supernatural things. In what seems like a dream, Mojica enters a bacchanal in which an entranced Vilma is about to wed Satan's son, and the master of ceremonies is none other than Coffin Joe. Can Mojica defeat his own creation to save Vilma?
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