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Dr. Ralph Hayes (Alvy Moore) is a professor of paranormal studies who leads a group into the Louisiana swamp to investigate a string of murders. His student Tasha (Thordis Brandt) is the psychic whose powers have been inherited from her witch ancestors. Hayes believes that witchcraft is the reason behind the murders of the young women, and reporter Victor Gordon (Anthony Eisley) is out to cover the story. The trail eventually leads to Luther the Berserk (John Lodge) a sorcerer of incredible powers who, after drinking the blood of his victims, has the ability to raise the dead as his unholy army of the night. The efforts of the human researchers collide with the supernatural forces of evil in this terrifying feature. Veteran character actor Burt Mustin, who played Gus the fireman on the hit television show "Leave It To Beaver," plays the boatman.