Donovan's Brain

A dead man's brain in a hidden laboratory told him to KILL... KILL... KILL

A mid-century sci-fi horror about scientific hubris and psychological possession, where a revived brain's psychic domination transforms its savior into a murderous vessel.

A scientist takes the brain of dead man and revives it via electrodes as it lays suspended in a tank of liquid. Soon, the brain grows to possess enormous psychic powers and inflicts its personality upon the doctor who saved it, creating a "Jekyll and Hyde" paradigm.