Re-Animator

Herbert West arrives at Miskatonic University Medical School after being expelled from Zurich, where his mentor Dr. Gruber died under circumstances West declines to elaborate on. He becomes roommates with Dan Cain, a sincere medical student engaged to Megan Halsey, whose father is the school's Dean. West is cold, precise, and conducting experiments in the basement. Dan finds the family cat dead in West's mini-fridge. West injects it with his reagent — a luminescent green fluid. The cat comes back as a feral, violent thing. Dan is now complicit.

They move their work to the medical school morgue, using fresh cadavers. Dr. Carl Hill is the school's celebrated neuroscientist — a man whose theories West dismisses as plagiarized from his dead mentor. One night, West reanimates a fresh corpse in the morgue; it goes violently berserk and kills Dean Halsey, who had come to investigate. West reanimates Halsey too, and they subdue him.

Hill discovers what West has done and attempts blackmail — he wants the formula and the credit. West responds by decapitating him with a shovel. Then he injects both the head and the body separately. The head can still think. The body carries it around. Hill — conscious in both pieces — uses stolen reagent to reanimate the morgue's other corpses, takes control of the reanimated Halsey, and kidnaps Megan.

Dan and West fight through a basement full of reanimated corpses. Hill's intentions toward Megan are thoroughly unpleasant. In the chaos, the reanimated Halsey strangles Megan with his own exposed intestines. Dan, refusing to accept it, injects her with the reagent. The film ends on her screaming, eyes wild, as she begins to come back — and cuts away, leaving whatever she is now in the dark.