The girls invite their friends from Pokey Oaks Kindergarten to their house for a slumber party. There Mojo Jojo sneaks in as Moejisha, so he can finally defeat them. He does so by using the Antidote X on them by splashing them with it, knocking them out and removing their powers. At this point, Mojo reveals himself to the guests, and gives a gloating rant about how the Powerpuff Girls are now normal little girls, only for the guests to beat him up with their pillows as the girls regain consciousness to see Mojo getting what he deserves for being a party pooper. They would get their powers back eventually. (thetvdb.com)