The 13th Treehouse of Horror episode, consisting of three self-contained segments.

Send in the Clones – Homer buys a hammock that can produce clones of himself. He creates numerous clones to help him around the house, but they soon overrun Springfield.

The Fright to Creep and Scare Harms – Lisa petitions the town to get rid of their firearms after discovering the gravestone of a young man named William Bonney who died from gun violence. However, Lisa soon discovers that William Bonney is the real name of Western outlaw Billy the Kid, whose ghost, along with the ghosts of other infamous criminals, takes over the defenseless town.

The Island of Dr. Hibbert – Dr. Hibbert invites the citizens of Springfield to his island resort, where he turns them into animals.

During the annual Jellyfish Festival, Ned Flanders realizes that he is lonely and becomes depressed. One night, he meets a beautiful woman, who asks him out on a date. He soon learns that the woman is Sara Sloan, a famous actress. Sloan is charmed by Flanders' wholesomeness, and they continue to date to the point at which she asks that he move to Hollywood. Flanders, worried that Hollywood would conflict with his conservative Christian values, refuses, so Sloan instead decides to stay in Springfield. However, their relationship does not work out, due to his insistence on marriage.

When the local library proves to be useless for the kids' class project, Marge tells Milhouse, Bart, and Lisa three Simpsons-style historical accounts: Henry VIII's (Homer's) attempts at siring a son, Lewis and Clark (Lenny and Carl) exploring the USA's wilderness with Sacagawea (Lisa), and Salieri (Lisa again) out to ruin piano-playing virtuoso Mozart (Bart).

Lisa lets her imagination run wild when she makes a new friend and they create a magical kingdom together called Equalia, complete with characters and plotlines. But they find themselves facing a nightmare when the boundaries between reality and fantasy are blurred. With the voice of Emily Blunt.

When Bart fails to turn in his homework, Mrs. Krabappel sends a letter home about Bart's behaviour. Despite Bart's best efforts to intercept it, Homer reads the letter, and he and Marge visit Principal Skinner for a parent-teacher conference. Furious, Homer punishes him, but Marge takes a more sympathetic approach. When Bart realizes he can pit Homer and Marge against each other to his benefit, his scheming reaches new heights.

Marge reconnects with a close group of mothers she used to be friends with; Bart tries to break up their group when his playdates stop being fun.

A black hole threatens to swallow Springfield, Homer tries to find the source of paranormal activity, and a "Back to the Future" parody in which Bart keeps Marge from marrying Homer.

Homer is shocked to discover that his bowling teammate is an accountant for Fat Tony and his mob. When Fat Tony gets jury duty, he appoints Dan as the temporary don of the mafia. Meanwhile, Lisa adds insects to her vegetarian diet after she passes out in the middle of a saxophone solo, but starts questioning her decision when bugs start pleading for mercy in her dreams.

Homer joins the "Springfield Preppers," an off-the-grid survivalist group whose leader has set up a top-secret retreat outside of town to prepare for the end of the world.

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.

Homer wakes up in a Springfield where everyone and everything is made out of Legos, and he must figure his way out before he gets stuck in the plastic world forever.

Homer is put in charge of keeping Princess Kemi out of trouble while her father, a Nigerian king, works out a uranium deal with Mr. Burns.

Not feeling unique, Lisa signs up for the Mars One Space Colony – to Marge’s dismay. Then, Marge hires Bart to go through the tryout process with Lisa to make her want to quit.

In a magical medieval world, Marge's mother is turned into an Ice Walker and the only way for Homer to afford the cure is to force Lisa to use illegal magic. When the King discovers this, he kidnaps Lisa, and Homer must lead a feudal uprising to save her.

When the Simpsons' flight to Gainesville gets re-routed to New Orleans, Lisa is forced to face her failures, and regain her confidence as a jazz musician. Meanwhile, Bart is intrigued by the voodoo in Louisiana, and Homer is intrigued by the drinking.

Comic Book Guy sues Homer for joyriding in his car. Meanwhile, Guillermo del Toro saves Mr. Burns from his troubles with the law.

The documentary crime series “Dateline: Springfield” goes in-depth to solve the case of Lisa’s missing college fund.

The Simpsons join other Springfield families on the Van Houten's annual trip to Costa Rica, which they obviously can't afford. While there, Homer befriends Patty's new girlfriend, Evelyn, and Lisa tracks down the real reason the Van Houtens can go on this trip every year

Bart becomes a successful caddy, but Marge worries it is ruining his character.

Marge and Mr. Burns fight for the soul of a brash young football prodigy.

When a plague of insects shuts down Springfield, the Simpsons face their greatest challenge yet… spending time in lockdown with each other.

A parenting disagreement between Marge and Luann Van Houten escalates into a life-or-death struggle for survival.