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Most of the latter-day "Dr. Jekyll" films feature not the titular medico but one of his close relatives or distant descendants. It is Jekyll's grandson, played by James Mathers, who figures into Dr. Jekyll's Dungeon of Darkness. Mathers holes up in the family cellar, luring unsuspecting victims into his lair. He then pumps his captives (principally underdressed females) full of grandad's "Hyde" juice, and look out! When originally completed in 1982, this low-budget goosebumpfest was titled Dr. Jekyll's Dungeon of Death.