The Fairly OddParents - Season 7 Episode 23 -

Tired of A.J. being a suck-up to Mr. Crocker and getting good grades for it, Timmy wishes that he was the teacher's pet, but Poof turns him into Mr. Crocker's guinea pig. The problem worsens because Mr. Crocker is going to use guinea pig Timmy for his experiment, which is a genetic hybrid of different animals that create the ultimate Fairy-catching monster.