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.
The film opens with a woman, Flora Bosch, walking her dog down an empty, darkened city street. As she passes by a manhole, Bosch is attacked by a creature, which drags her and the dog into the sewers.
George Cooper (John Heard) lives with his girlfriend Lauren (Kim Greist). George, a once-prominent fashion photographer, has since forgone the fame and fortune. His current project is photographing New York City’s homeless population, specifically those known as “undergrounders”, or people who reside within the bowels of the city.
Captain Bosch (Christopher Curry) has a personal interest in the recent flood of missing persons (most of whom are homeless) being reported to his precinct. Bosch interviews A.J. “The Reverend” Shepherd (Daniel Stern), who runs the local homeless shelter. Shepherd believes recent events to be a part of a massive government cover-up and has the evidence to prove it. Bosch’s superiors know more than they are letting on and seem to be taking their cues from the overly glib and weaselly Wilson (George Martin), who works for the Nuclear Regulatory Commission…