All of the Snot-Bots' plans to bring contaminated chaos to Electropolis have been thwarted by those disgusting heroes of hygiene, the Clean Team. But their leader, Sludge, has something different in mind this time. Instead of going big, he's going small—microscopic, even. He's launching millions of nasty nano-bytes called Fart-Bots into the atmosphere to spew a giant cloud of gas over the city. Have the Snot-Bots finally found a way to foul up the city for good? Or will the Clean Team keep Electropolis smelling sparkling fresh?