The Simpsons Season 19 Episode 13
Overview
Bart teams up with a new kid at school, Donny, to pull some pranks, but when the hijinks go haywire, Groundskeeper Willie tips Bart off to the fact that there might be a rat amongst his friends. Meanwhile, Homer becomes attached to a loaner vehicle while his is in the shop being repaired.
Director: Matthew Nastuk
Guest Star: Marcia Wallace, Terry Gross, Topher Grace