Imaginary Fiend / Cootie Gras

S2, E9: "Imaginary Fiend" Mike, the new boy in school, has a special friend nobody else can see: Patches. When this imaginary friend begins destroying the class, the Girls must imagine how to stop him. "Cootie Gras" Mojo observes that everyone is staying away from little Harry Pitt because he has "cooties." Even the Girls! So Mojo concocts a plan to keep the Girls away by using this cootie covered boy as bait.