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Needles figure prominently in this blood-soaked entry in the slasher genre. It begins as psycho scientist Dr. Stein begins implanting things in baboons. Dr. Theresa McCann, a colleague at the hospital where they both work is suspicious as to the nature of the perverse professors experiments. Those suspicions increase when one of the apes suddenly dies. Then Stein steals one of her patients. When that patient is found murdered, with only a lollipop left as a clue, McCann gets blamed and suspended. When McCann spies the abandoned sucker she suddenly realizes it belongs to Dr. Matar, an ex-lover in search of revenge against her because she squealed on him and his illicit experiments in tissue regrowth. Matar goes on a killing spree and now only she and her new lover Hendricks can stop him.