On Thanksgiving, Bart gets into a fight with the family and runs away from home, before sharing a turkey dinner with a group of homeless people at a soup kitchen, and learning the true meaning of the holiday in the process.
While skateboarding down the street, Bart is hit by a car driven by Mr. Burns. Homer turns down Mr. Burns' token offer of $100, and instead hires ambulance-chaser Lionel Hutz to bring an outrageous lawsuit against the millionaire.
After Grampa is hospitalized, he reveals that Homer has a half-brother, and the family soon discovers the brother, named Herb, owns a car company. However Herb's hiring of Homer to design a new car may be his undoing.
Homer must decide which is more important: completing counseling to save his marriage or skipping out to catch a legendary catfish. Meanwhile, at home, Bart and Lisa take advantage of Grampa's ignorance of the house rules.