Beneath the quaint spender of a San Francisco mansion there lurks an unspeakable evil - Dr. Jekyll's Dungeon Of Death! There, deep in the bowels of his underground lab, Jekyll conducts a bloody experiment with human life in desperate attempts to recreate his great grandfather's secret serum. Assisted by his lobotomized sister and a giant black cripple, Jekyll searches the dark streets of night for unsuspecting victims who are to become his tortured "guinea pigs". Failure brings desperation as Jekyll holds a professor's daughter hostage to get him to cooperate with his mad plan. A final confrontation between good and evil brings about a blood-soaked climax that will both shock and astound you. Aka; "Dr. Jekyll's Dungeon of Darkness", "Dr. Jekyll's Dungeon of Darkness", "The Dungeon" and "The Jekyll Experiment"