Lisa discovers Marge's vintage clothes from the 90's and is welcomed into the school's elite fashion club.
Homer gets Superintendent Chalmers a job at the power plant; Chalmers discovers huge mutated snails that produce valuable slime, launching his new career.
The town is menaced by a mysterious murdering monster from out of the sewers; Krusty has a demonic special guest on his live Halloween special; Springfield's post-apocalyptic future.
Marge turns to a Man Camp to save the men of Springfield from themselves.
Homer and Marge can't decide if Bart is naughty or nice.
When Bart becomes Professor Frink's lab assistant, the Simpsons are thrown into a world of tech billionaires determined to live forever.
Bart runs against Mayor Quimby's son for student council president; Lisa learns troubling secrets about the Quimby clan -- and about the Simpsons.
After a mysterious buyer purchases every ticket for the K-pop concert Lisa wants to go to, the Simpsons have to figure out the identity of this evil ticket reseller.
Patty and Bart team up for the ultimate prank -- getting Homer declared legally dead; to their chagrin, Homer loves being officially dead -- which leads to Patty and Selma having a huge fight and Patty moving away to "Palm Springfield."
A cable channel films a Christmas movie in Springfield, and Skinner falls in love.
When the rest of the family seems to lack Christmas spirit, Marge contacts Martha Clause (guest voice Martha Stewart).
Homer thinks Bart's new friend is orchestrating a terrorist plot and tries to warn the residents of Springfield about the imminent disaster.
The Simpsons appear in three Christmas tales: the story of the birth of Jesus; a World War II tale featuring Grampa, Mr. Burns, and Santa; and a musical featuring “the nutcracker suite.”