The psychopathic grandson of Baron Frankenstein, calling himself Oliver Frank, has found an ideal position in sunny California as an assistant to chemist Carter Morton, and lives with him, his teenage daughter Trudy, and the gardener with whom he's secretly carrying on the family tradition. He's also been testing a drug on Trudy when he's not hitting on her, and otherwise behaving badly. Needing a brain (always the Frankenstein Achilles Heel), and when sexually spurned on a date with Trudy's friend Suzie, he seizes the moment and runs her down with his car. After successfully transplanting her brain, he dubs the creature his daughter. More mayhem ensues, with Oliver and his daughter coming to their end at the hands of Trudy's beau, Johnny