Marge and
Homer arrive home from a date when
Lisa tells them the Springfield Retirement Castle has been shut down for massive violations, and
Grampa has nowhere to live. When Grampa is picked up by the family, Marge sees that
Jasper and the
Old Jewish Man have no one, so she invites them to stay with them. With Grampa and his friends annoying Homer, Lisa says she and
Bart are getting cues on how they will take care of Homer when he is older. She asks her dad to be nice to Grampa, whom she calls a "treasure". Homer's efforts to be nice leads to him surprisingly enjoying the senior citizen lifestyle, and they induct Homer into their club. Unfortunately, Homer's appreciation for all things elderly irritates Marge, and she tells
Patty and Selma that while she did not mind when he got bald and fat, she never expected him to act older than her. At school, Bart and his classmates undress for gym class.
Nelson changes, but his classmates laugh at him when they see he is wearing his mother's underwear. Bart says he is wearing Homer's hand-me-down briefs. The class is moved by Bart's kind act. To thank him, Nelson,
Dolph,
Kearney, and
Jimbo induct Bart into their ranks. The group goes to a meeting at the Bully Summit held by Chester, the leader of all bullies. They are required to turn in their weapons, but Bart forgets to turn in his slingshot. When a more rebellious bully uses Bart's slingshot during Chester's speech, he blames Bart, who with Nelson, Dolph, Kearney, and Jimbo, try to return to Springfield without getting beaten or killed by all the enraged bullies. The five make it to the subway, but the Baseball Furries are waiting. Bart uses his slingshot to break the street light and distract them. One stays behind, and Nelson sacrifices himself to allow the others to escape. As the sun is rising, the four make it back to the Springfield beach, where Homer and the old men are taking a stroll. Homer sees his son is in trouble and wants his friends to help, but they demur in cowardly fashion. Homer confronts the enemy bully and punches him. The bully begins crying and runs off with his allies while Bart, Homer, and their crews walk back home. That night, Homer returns to normal and has sex with Marge. ==Cultural references==