Springfield is inundated with holiday revelers after the nuclear power plant springs a radiation leak, causing snow to fall all over town. When the tourists drive up Christmas shopping prices, Marge opens up the Simpsons' house to boarders.

Lisa discovers her new best friend is a Republican who is opposing her in the class election.

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

Principal Skinner promises the students that the best-behaved among them can take a ride in a submarine. When Skinner gives all the kids a clean slate, Bart believes even his own past indiscretions will be forgotten if he doesn’t get into any more trouble. Meanwhile Lisa tries to help a cash-poor Krusty to turn things around by suggesting he sell the foreign rights to his shows.

Homer becomes annoyed with movie theaters, so Bart teaches him how to download movies illegally. Homer is delighted with his discovery of free movies until he's caught for piracy. Deputy Director Gratman, the FBI's anti-piracy boss, is tasked with hunting down Homer, who stands accused of illegally downloading a film.

When Marge tries Homer's new high-tech glasses on, he learns she's seeing a marriage counselor; Bart refuses to buy Nelson a Valentine's Day card.

During a research trip, Lisa learns that Sideshow Bob is the chief scientist at a big chemical engineering company; Marge tries to teach a teen church group about healthy sexual practices.

A recent transfer student named Diggs rescues Bart from a confrontation with bullies.

When Retirement Castle is closed, Marge asks Grampa and two other octogenarians to move in; Nelson befriends Bart after Bart defends him.

After Lisa's new pet guinea pig destroys the Simpsons' living room art, Marge finds a beautiful painting at the Van Houten's yard sale, which Homer snaps up for 20 bucks

Homer is recruited as a World Cup referee after Lisa extols his integrity on the youth soccer field in a Springfield Elementary speech contest. But when the Simpsons travel to Brazil (again), Homer finds his honesty tested by one of South America's slickest gangsters in the soccer match-bribing business.

Lisa dates a competitive eater; Bart benefits from helping convict Snake Jailbird escape from a jam.

Set in the future, Homer has a new clone for every time he dies. Lisa is married to a zombie version of Milhouse, while Bart deals with custody issues with his ex-wife, Jenda. Each defines what love means to them.

When Bart's voodoo doll spell accidentally makes his teacher pregnant, he becomes a savior to couples hoping to conceive.

Marge swears off befriending any more couples when Homer offends their charming new British neighbors, but when Lisa declares that she, too, doesn’t need friends, Marge reconsiders.

The Planet Express crew come to present-day Springfield to prevent the Simpsons from destroying the future.

When Bart disrespects Homer's authority, Homer makes a point to try his hand at parenting. This proves fruitless, so Marge signs them up for the Relation Ship, where they'll resolve their conflicts at sea. Meanwhile, Marge is in charge of Homer's fantasy football league, but manages to win despite being the underdog.

Bart feels guilty after he wins the annual "last day of school" race around Springfield Elementary School, with help from Nelson, who beats up the frontrunner, Milhouse. Meanwhile, Homer tries to bring back 4th of July fireworks after they are canceled due to budget cuts.

Marge opens a sandwich franchise store after her sandwiches become a huge hit at Springfield Elementary. But running day-to-day at the store proves challenging, especially when the same franchise opens another location across the street.

A Springfield resident dies, Krusty retires after he's offended by a comedy cable channel roast of him, and Lisa tries to protect Homer from getting hurt.

In a Halloween-theme episode Bart reads Aramaic symbols from the bottom of his desk and he and Lisa are transported to an alternate world filled with demons. Also, Moe organizes a "Clockwork Orange"-ish gang in which member Dum (Homer) falls for a young lady (Marge) who wants him to quit. In a homage to "The Others," the Simpsons reconnect with their earlier incarnations from the Tracey Ullman era.

Lisa brings in assembly woman Maxine Lombard to put a stop to Mr. Burns' fracking operation, but is taken aback when the two political opponents find themselves attracted to one another.