The erotic Dr. Jekyll & Mistress Hyde stars Julian Wells as Dr. Jackie Stevenson. Dr. Stevenson theorizes that a woman's psychological makeup consists of two parts -- a wholesome side and a dark side. She creates an elixir that cleanly divides these two aspects in the person who imbibes it. Her first test subject turns into a sexually charged maniac who seduces the doctor. When she begins testing the potion on herself, she sinks into a darker and darker world of sexual addictions.