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The target audience for this supernatural thriller is never quite clear: the film's poster attempts a psychedelic look, as the ad copy touts "the black mass...the spells...the incantations...the curses...the ceremonial sex," and other ad copy says "He curses the Establishment." In the film, Andrew Prine plays a Los Angeles sewer-dwelling warlock who discovers that his magical talents are more powerful than he had imagined, leading him to power among a group of cult followers. The role of the Satanic cult leader is played by Ultra Violet, a celebrity in artist Andy Warhol's community.