South Park (1997)

S11E3 Lice Capades

A head lice outbreak sweeps through South Park Elementary, but Mrs. Garrison won’t disclose which student is responsible for the infestation. Determined to identify the culprit so the other kids can tease them, Cartman takes on the challenge. Meanwhile, a louse named Travis is frantically trying to protect his fellow lice from the impending doom posed by the awareness of the outside world.