Deep under Electropolis, Sludge is watching from the Fartress of Foulitude as his arch enemies, the Clean Team, are awarded the Key to the City. Disgusted by the sanitary ceremony, the master of muck sets out to put his squeaky-clean rivals in their place for good! Will the Snot-Bot leader's fiendish scheme succeed? Or will the Clean Team foil his plot before his filthy crew can ruin the city?