When a cockroach-spread plague threatened to decimate the child population of new york from the initial Mimic, biologist Susan Tyler and her research partners developed a species of"Judas" bugs and introduced them into the surroundings, where these were to"mimic" the diseased roaches and infiltrate their grubby habitats. The program worked until the bugs evolved to mimic their next prey....humans! When these were all thought to be dead, then the giant cockroaches are back, and this time around they've mutated to take on human form!