As future Lisa writes her college application essay for Harvard, she recalls past disappointing birthdays that helped shape her.

When Bart goes missing, the town puts together a search party to find him. After most give up hope, Sideshow Bob manipulates Millhouse into revealing where Bart is hiding.

When the Simpsons go to a STEM conference, Lisa falls for a crooning jazz pianist named Brendan. Meanwhile, Bart discovers that he has an affinity for chemistry

Mr. Burns will build a doomsday ark after he believes that the end of the world is near when he sees an old Orson Welles show about Nostradamus. Meanwhile, Professor Frink comes up with a new way of testing everyone in Springfield after Burns wants a test to determine who should go on a spaceship with him.

When Homer is accused of stealing a million-dollar painting, only a detective from the 1970s can clear his name.

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

In an attempt to bring the family together, Marge forces everyone to hand in their electronics and take a trip to a book store.

Everybody is now horrified of clowns after Bart's prank using clown masks, which also causes Krusty to lose his job. He attempts a comeback as a dramatic actor in the play "The Salesman's Bad Day", with Llewellyn Sinclair as his director.

Grampa makes a confession to Homer while on his deathbed. After his recovery, he comes to realize that this issue will not be easy to reconcile.

Homer and Marge follow Moe after the bar closes early and discover him and his father fighting. The Simpsons, after finding out that Moe has been excommunicated from his family for years, attempt to bring them back together.

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.

Homer gets Flanders a job at the plant, and he soon learns that no good deed goes unpunished when Flanders starts to insist on carpools and demands more from Homer's work performance. Meanwhile, Marge feels as though their marriage has lost its spark.

The Simpsons go to Denmark so Grampa can benefit from its free health-care system.

Bart falls into a coma after being struck by lightening.

Marge and Homer's marriage is tested when they travel to a tropical island to compete for a million dollars on Marge's favorite reality competition show.

Homer wins an oyster-eating contest against the mythical Cthulhu, Springfield is overrun by plant body-snatchers, Lisa finally snaps and Mr. Burns opens a retirement home with some Jurassic upgrades.

God and St. Peter contemplate what merits a soul getting into heaven, while citizens of Springfield remember their divine encounters.

A self-driving car company comes to Springfield, poaching all of the power plant employees with their fun work environment.

Bart takes a dare, and ends up in the hospital. To cover for himself and Homer, he says he went to Heaven and met Jesus. Christian producers offer the Simpsons a movie deal, which Homer takes. But Bart can't deal with the guilt and comes clean to Marge after the movie is finished.

On a mission to play hardcore pranks, Bart, Nelson and Milhouse get Moe a mail-order bride on the Dark Web.

Marge wants a job, and stumbles into becoming a plastic food storage container-selling drag queen. Meanwhile, Lisa tries to make the world better in the style of "Amelie"

Homer finds his calling as a TV recapper, but his harsh grading causes a brawl with Krusty. After almost killing Homer, Krusty hides out at a real circus, and finds happiness there.