Dr. Jackie Stevenson (Julian Wells) is a controversial therapist who believes the female psyche consists of the 'pure' and the 'lustful,' and she has developed an experimental serum that will separate the two halves, thus freeing women from psychological and sexual inhibitions.  Jackie tests the drug on a depressed young woman (Misty Mundae) who immediately becomes a maniacal love machine that ravishes Jackie in her office.  Turned on by the encounter, Jackie decides to experience the effects of the drug first hand, and it transforms her from a plain and mousy doctor into a stunning and sensuous vixen who craves endless erotic satisfaction.  Stalking the streets at night as her predatory alter ego, Jackie indulges all her deepest lesbian fantasies.  A smouldering one-night stand with a hooker leads to further steamy seductions, menacing menages-a-trois, and a wild encounter with Jackie's own house maid who fails to even recognize her.  As Jackie becomes more and more addicted to the drug and the carnal pleasures it promises, she begins to lose all control...and who knows how far she will go to satisfy her 'other' insatiable self.