South Park Episode 614 - "The Death Camp of Tolerance"
A loveable new character, Mr Slave, makes his debut as Mr. Garrison desperately tries to get fired from his new job as the boys' 4th grade teacher.
Meanwhile, our little heroes get sent to the Deathcamp of Intolerance for not tolerating Mr. Garrison's intolerable behavior (e.g. sticking a gerbil up Mr. Slave's ass). Lemmiwinks (the afore-mentioned gerbil) guest-stars.