Bart ends up in trouble with school bullies after Jimbo's girlfriend develops feelings for him; Homer buys a treadmill equipped with a TV.

When Flanders' parents prove to prefer Homer's company to his, he jealously responds by giving Homer a shiner, and then tries desperately to reconcile with him. Meanwhile, Lisa is at a loss to understand why a new substitute teacher is bullying her for no obvious reason.

When Comic Book Guy meets a woman writing an autobiographical manga, he seeks Homer's advice on dating.

After performing CPR on a tased raccoon, Lisa discovers her calling to be veterinarian and becomes an intern at the local office, but learns a tough lesson when her neglected class hamster dies. Meanwhile, Marge moonlights as a crime scene cleaner for a little extra money, and the trauma of the gory scenes make her increasingly dead inside.

Homer and Marge recount the story of their transition from loving their life without kids to being miserable parents.

Lisa gets called for jury duty while Marge becomes obsessed with her exercise bike.