After finding a box of old shoes, Al and Jefferson turn the shoe store into a 70's themed retro shoe store.

It is really hot and the Simpson family does not have air conditioning. They try to live in a tent beside the refrigerator, but that does not work. Otto drives by with a traveling swimming pool. This gives Bart and Lisa the idea to hound Homer for a pool which they relentlessly do until he caves in and buys them one. All the kids in the neighborhood come by to use it. Bart tries to jump from his tree house into the pool, but winds up breaking his leg. He will have to spend the rest of the summer in a cast, so there will be no more swimming for him. He watches as Lisa becomes incredibly popular. Bart finds himself a new hobby by spying on the neighborhood with Lisa's telescope. While looking out the "Rear Window" of the house, Bart thinks he's seen Flanders commit a murder. He gets Lisa to break into Flanders' house and look for clues. He watches as Flanders returns home with an axe. He goes to help her, broken leg and all. Then Flanders tells them that Maude has been away at bible camp, but now she is back.

Following visions from recent dreams, Professor Xavier sends his X-Men on a mission to the Eagle One Space-Station, putting them in the middle of an interstellar conflict.