Shortly after receiving an anonymous check for $5 million, H.E.A.T. are called toIllinois, where a gigantic mutated chilopod, Megapede, is devouring thousands of dollars worth of crops. The team are unable to stop the creature when they first encounter it, and upon finding it again, they discover it has metamorphosed into a gigantic cicada. The insect's mating call is disrupting all radar in Chicago, and now H.E.A.T must find a way to silence the creature long enough to launch a counterattack.

During a nice relaxing day at the beach, the team is caught off-guard by a twister. They trace its origins to an experimental energy experiment at a local power plant, as well as discovering strange tracks near the plant. When the twister strikes again, H.E.A.T. discover that a giant mutant shrew has been bonded to the twister, creating a 'Shrewster', and now the race is on to defeat it before its ravenous metabolism drives it to eat all of New York.