Marge crashes Homer's car while driving kids to school.

Bart meets new troublemaker Donny at school.

Donny insults Mrs. Krabappel and challenges Bart's authority.

Marge gets a luxury loaner car while hers is repaired.

Homer consoles Bart about Donny and they bond in the car.

Bart fails at basketball in front of Donny.

Principal Skinner announces a confusing new lunch plan.

Donny pulls a prank and Bart takes the blame.

Skinner and Chalmers recruit Donny to spy on Bart.

Bart shares prank secrets with Donny.

Bart and friends have a juice box fight with Donny.

Homer and Marge take a romantic drive in the loaner car.

Bart plans a prank with crickets in the coffee pot.

Groundskeeper Willie tells Bart that Skinner has a spy.

Bart suspects Donny is the rat and confronts him.

Bart falsely accuses Milhouse of being the rat.

Bart plans to egg Skinner's house with an ostrich egg.

Homer learns his old car will be destroyed and defends it.

Donny is revealed as the rat and Skinner confronts them.

Donny explains why he became a rat for Skinner.

Skinner and Willie trap Bart with a Mentos and Diet Coke explosion.