Cutification Mind Control!
I always loved Eek-Stravaganza. It was always good at pushing the envelope of acceptable jokes in a kids' cartoon, without resorting to nausea and mental anguish like some cartoons. (Ren & Stimpy and Spongebob are primary offenders). This was requested by a friend who really likes the idea of mind control and personality-altering, especially into forced cuteness.
From the episode The Eeksorcist