In a magical medieval world, Marge's mother is turned into an Ice Walker and Homer forces Lisa to use illegal magic to cure her; Lisa is kidnapped and Homer must lead a feudal uprising to save her.
Marge and Lisa turn Lisa's experiences into a pop culture hit, but they struggle with creative differences.
Homer discovers Maggie's whistling talent and launches her baby-celebrity career; When Marge impresses Fat Tony with her interior design taste, he hires her to style his brothel.
Maggie becomes possessed by an ancient demon; Lisa discovers a perfect version of her family in an alternate universe; Homer cannibalizes himself.
Grampa gets a hearing aid and finally hears what everyone has been saying about him; Principal Skinner discovers that his mother has kept a secret from him.
Marge is frustrated with the local government and decides to run for mayor; she makes Homer the butt of her jokes to win public support.
Homer reunites the old bowling team to cheer up Moe; the bowling team must compete with arrogant millionaires; Lisa and Marge try to teach Bart that money isn't everything.
As future Lisa writes her college application essay for Harvard, she recalls disappointing birthdays that helped shape her.
The town puts together a search party after Bart goes missing; Sideshow Bob tries to force his whereabouts out of Millhouse.
The Simpsons go to a STEM conference; Lisa falls for a crooning jazz pianist; Bart discovers he has an affinity for chemistry.
Fearing that the end of the world is near, Mr. Burns tasks Dr. Frink with testing all of Springfield's residents to determine who is worth saving.
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.
Bart goes to prankster rehab after a clown-mask prank terrifies the town and destroys Krusty's career; Krusty tries his hand at serious drama with a regional theater company.
In an attempt to bring the family together, Marge forces everyone to give up electronics for the day and take a trip to a book store.
Homer and Marge follow Moe after the bar closes early and discover him and his father fighting; they attempt to bring Moe and his father back together.
When the Simpsons' flight is rerouted to New Orleans, Lisa rediscovers her passion for jazz; Bart is intrigued by voodoo; Homer is intrigued by drinking.
Grampa makes a confession to Homer while on his deathbed, but when he makes a recovery, he comes to realize that the issue will not be easy to reconcile.
Homer gets Flanders a job at the plant; Homer regrets it when Flanders starts to insist on carpools and demands more from Homer's work performance; Marge feels that her marriage has lost its spark.
The Simpsons go to Denmark so Grampa can benefit from the country's free health care.