Two teenagers arrive in Hong Kong from Guang Zhou, hoping to find money and prosperity. Ah-man becomes an auto-mechanic; Lin works at an assembly line. After beeing drugged and raped by her Boss, Lin leaves the job and becomes a call-girl where she meets small-time hood named Wing. When Ah-man looses his position at the garage, Lin convinces Wing to bring him into the mob.
When Billy Peltzer is given a strange but adorable pet named Gizmo for Christmas, he inadvertently breaks the three important rules of caring for a Mogwai, and unleashes a horde of mischievous gremlins on a small town.
After losing their academic posts at a prestigious university, a team of parapsychologists goes into business as proton-pack-toting "ghostbusters" who exterminate ghouls, hobgoblins and supernatural pests of all stripes.