A new kid at school named Donny works with Bart on his pranks. But when the pranks start to backfire, Bart wonders if he can trust his new accomplice. Meanwhile, the Simpsons get a fancy loaner car after Marge gets in an accident, and Homer falls in love with it.

When Lisa spots a new best friend from the window of the bus, she gets a taste of what life could be like with a different, more cultured family.