BRAIN DAMAGE

Brian begins an unwilling symbiotic relationship with a malevolent leech-like brain-eating parasite called "Aylmer". Aylmer secretes a highly addictive drug-like hallucinogenic blue fluid into Brian's brain. Brian, hopelessly hooked on the fluid, is forced to do what Aylmer wants. In return for a steady supply of the drug, Brian must seek out human victims for Aylmer, so that he can eat their brains. All the while, though, as Brian adopts a heavily secluded life in his addiction to Aylmer's blue fluid, it begins to draw a rift in his relationship with his girlfriend Barbara and his brother Mike.

The film climaxes with Brian allowing Aylmer to kill Barbara, soon after which he is confronted by Morris and Martha, a middle aged couple who were Aylmer's previous hosts before he escaped and found Brian. Holding Brian at gun point, they retrieve Aylmer from his back, but Aylmer fights back and kills them both. But while Aylmer is feeding Brian his next dosage of blue fluid, Morris, who is still alive, fiercely grabs Aylmer and accidentally squeezes an overdose of the drug into Brian's brain, causing him severe agony as it goes in to overload.

Aylmer dies and Morris succumbs to his injuries while Brian, still in agony from the overdose, retrieves Morris's gun and shoots himself in the head after returning to the apartment he shares with Mike. The movie concludes with the police bursting in on Brian, not dead from the gunshot but now with a glowing hole in his head. Brian's ultimate fate is left unknown.