The Powerpuff Girls Season 4 Episode 6 Nano of the North Episode Title:Nano of the North.Episode Description:Nanobots— microscopic robots— rain on Townsville to eat all the carbon in it, including clothes. The solution is to have the girls shrink to microscopic size to defeat them. However, they are too powerful for the girls and they are defeated. It is by the intervention of Professor Utonium that Townsville is saved.