After nearly drowning in the bath tub, Mr. Burns decides to find an heir, and holds auditions at his mansion. Homer gives Bart cards to read, but reading them, he sounds like a moron. Humiliated, Bart vandalizes Burns' mansion. Burns sees this and like Bart's malevolence, so picks him after all.
Bart spends time with Mr. Burns, where he is given the life of luxury. Back at home, he acts rambunctious and Homer tries to punish him. Bart goes back to live with Mr. Burns because Burns nurtures his destructive side.
After a while, Bart misses his family and wants to go home, but Burns convinces Bart that his family don't want him back. At the power plant the next day, Burns asks Bart to fire Homer. Bart instead fires Burns and drops him through the trap door.