In the depths of the sewers of a bustling city, an unusual experiment turns into a nightmare. During tests for a space research program, a group of scientists decides to dispose of biological waste by throwing a baby alligator into the water. But they don't anticipate that the small reptile, fed with toxic substances, will grow to colossal size with an insatiable appetite. Years later, following a series of mysterious disappearances, a local detective named David (played by Robert Forster) finds himself drawn into chaos as the remains of his victims begin to surface.
As the city plunges into panic, David teams up with a herpetologist in an attempt to track down the monstrous alligator, which has made the city's sewers its home. With its sharp teeth and killer instinct, the creature becomes a monstrous urban legend, preying upon unsuspecting residents. Tensions rise when the detective realizes they must act quickly before the alligator decides to surface, putting everyone in danger. Teaming up with other experts and using rudimentary ingenuity, David embarks on a dangerous mission to capture the beast before its fierce attack turns into a tragic event in the heart of the city. Action, suspense, and guaranteed old-school special effects!