South Park: Season 11, Episode 3

11 - 3: Lice Capades

When a breakout of headlice hits South Park Elementary, Mrs. Garrison refuses to say which child brought the plague to the school. So, Cartman takes it upon himself to find out who it is so the kids can make fun of them. Meanwhile, a louse Travis, is desperate to save his fellow lice from imminent destruction from a conscious world.