The next mission takes Charlie and Itchy to the sewers to help a colony of mice. Toxic smelling paint and other junk washed down the drains, taking away their freedom of living without worries. They join forces with Moxie, a mother mouse in the colony, to crack the case, and follow the drain to Carface and Killer's curio shop, where the villainous duo trying to transform new looking toy trains to look like antiques to sell for big money.