A rash of bizarre murders in New York City seems to point to a group of grotesquely deformed vagrants living in the sewers. A courageous policeman, a photo journalist and his girlfriend, and a nutty bum, who seems to know a lot about the creatures, band together to try and determine what the creatures are and how to stop them.
- A recent article in a New York newspaper reported that there were large colonies of people living under the city... The paper was incorrect. What is living under the city is not human. C.H.U.D. is under the city.
Ugly. Slobbering. Ferocious. Carnivorous.
- They're not staying down there, anymore!
You Won't Want To Know What It Means.