Given the question: Build a movie plot around this: Who is turning into mutated creatures? Homeless.
The answer is:
The film opens with a woman walking her dog down an empty, darkened city street. As she passes by a manhole, she is attacked by a creature, and the dog is pulled in after her.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.A police captain named Bosch (Christopher Curry) is introduced. Bosch 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 an overly glib, weasely type named Wilson (George Martin), who works for the Nuclear Regulatory Commission.It turns out there are monsters lurking beneath the streets; beings that were once human, but have been mutated by radioactive, chemical toxic waste into hideous, flesh-eating creatures that prey on the homeless who live in the underground. Given the recent drop in the underground transient population, the creatures have resorted to coming to the surface through sewer manholes in order to feed. Through a series of events, both George and A.J. find themselves trapped in the sewers, a reporter gets involved (and eaten), and Lauren has a problem with both a clogged shower drain and an unexpected visitor that comes up through the sewer access point that she unfortunately decides to open in the basement of her apartment building. Then, through the dangerous investigative efforts of both A.J. and George, the absolute horror is revealed: The Nuclear Regulatory Commission is directly involved in the slaughter that has been...