Deep in the sewers beneath the city of Regent Park, another baby alligator feeds on the experimental animals discarded by Future Chemicals Corporation. Nourished by toxic growth hormones and other mutating chemicals, the gator grows immense in size, develops a voracious appetite and goes out on a killing spree. No one believes the sightings until a large number of people are killed, and the police eventually embark on a search-and-destroy mission to put a stop to the alligator's murderous rampage.