The Silverfish family, new to the Undersink apartments, are charmed by the Christmas bug caroling and decide to host a New Year's Eve party to foster community. They invite all their bug neighbors, including the scholarly Spider family, the refined Cockroach family, and various other residents of Kit-Chen, promising a night of unprecedented hybrid fun. The party quickly descends into comical chaos as the different species, with their unique customs and temperaments, interact, leading to a series of amusing mishaps.