The Simpsons' twenty-fourth season began airing on Fox on September 30, 2012 and concluded on May 19, 2013.
Bart will be visited by many of his past girlfriends. Zooey Deschanel, Anne Hathaway, Sarah Silverman, Natalie Portman, and Sarah Michelle Gellar will guest star, reprising their roles as Mary Spuckler, Jenny, Nikki McKenna, Darcy, and Gina Vendetti.
Marge and Homer go back to ancient Mayan times and learn that the world will come to an end in 2012; and a glitch in the Springfield Subatomic Supercollider wreaks havoc on the city.
When Marge's car falls into a sink hole, she buys the perfect replacement to fit her family of five. But she quickly grows to hate it because, as she tells a shocked Homer, the car would be too small if she wanted to have another baby. Meanwhile, Bart and his friends are determined to find out what secret Lisa is keeping when Bart finds her cryptic messages and follows her sneaking off downtown for covert meetings after school.
Homer and Marge try to track down Grampa by following clues from his past, while Lisa struggles to resist gambling away her college fund.
Homer is shocked to discover that his bowling teammate, Dan Gillick (guest voice Steve Carell), is an accountant for Fat Tony (guest voice Joe Mantegna) and his mob. Meanwhile, Lisa adds insects to her vegetarian diet after passing out during a saxophone solo, but starts questioning her decision when bugs start pleading for mercy in her dreams.
Homer wins a MyPad at the school auction and quickly becomes obessed with it. He goes into a funk when he breaks it, until Ned Flanders discovers a miracle tree in the Simpsons' back garden.
A "cool family" from Portland moves in next door to the Simpsons. Homer is desperate to befriend them, while Marge is skeptical, worried about some of their more eccentric qualities.
A distracted Homer allows Santa's Little Helper to get loose, and the family are furious with his unconcerned attitude, until Grandpa shines some light on things by telling them the story of Homer's childhood pup, Bongo.
With the end of the world looming, Homer decides to join an off the grid group of survivalists who've set up a secret sanctuary outside of Springfield to prep for the apocalypse. However, a skeptical Marge is suspicious of the plans.
Springfield Elementary must depend on Bartificial intelligence when it's threatened with closure after doing poorly on standardized testing, and since Bart's the only one who missed the exam, it's up to him to raise the average grade to save the school.
A tornado inspires Homer and Marge look for guardians for the kids in case something bad happens; Marge questions the motives of potential guardians.
Bart's dream girl, Mary Spuckler, comes to town, but his failure to pay her enough attention is having a negative impact on their relationship. Meanwhile, Homer once again runs afoul of Marge and lands in the doghouse.
Bart and Milhouse explore the perks of being an adult when a shaving accident leaves Milhouse looking exactly like his father, Kirk.
Marge fears Maggie is slipping into the clutches of children's television.
Homer's obsession with the TV show "Storage Battles" leads the family to discover Grampa's past identity as "Gorgeous Godfrey," the most feared, villainous man in pro-wrestling history.
What's more amazing, he was once revered by a young Montgomery Burns, who now convinces Grampa to get back in the ring. But when Bart starts to adopt some of his grandfather's former cheating ways, Grampa must reconcile with his past before it's too late.
When Flanders' parents prove to prefer Homer's company to his, he jealously responds by giving Homer a shiner, and then tries desperately to reconcile with him. Meanwhile, Lisa is at a loss to understand why a new substitute teacher is bullying her for no obvious reason.
Lisa comes to her brother's defense when Bart is accused of an Easter prank involving the school marching band, the horn section and some rotten eggs. Meanwhile, Mr. Burns seizes the opportunity to realize his lifelong ambition to become a superhero.
Homer's behavior once again lands him in hot water with Marge and he needs to fathom a way to save his marriage, while a dose of "A Streetcar Named Desire" drives Milhouse to affect a Marlon Brando-esque bad-boy demeanor in an effort to impress Lisa.
Homer is recruited to be a deacon by the cutting-edge new pastor. The dry cleaner mistakenly switches Marge's wedding dress for one of Krusty's costumes.
Moe is flying high after venture capitalists take a shine to his homemade whiskey, while Grampa, after injuring himself babysitting Bart, decides he'd rather be looked after by his grandson than be at the nursing home. Also, Lisa voices her displeasure at a hologram of music legend Bleeding Gums Murphy, and Sonny Rollins (as himself) shows up to ask her to stop all that jazz about boycotting a record label.
Marge encourages Bart to explore his creative side, and his initial reticence quickly subsides when she hires Slava’s beautiful daughter, Zhenya, as his new piano instructor.
Homer is shocked when he loses the last two hairs on his head, and employs a wide variety of headgear to try and keep his new found baldness a secret from Marge.
Homer, Moe, Lenny and Carl win $200,000 in the Springfield Lottery. But when Carl takes off to Iceland – his homeland – with all the winnings, the guys embark on a Nordic adventure to get the cash back.
Marge mistakes Sassy Madison, a swinging-type website, for Dolly Madison, a cupcake site, not realizing it’s a destination for married people seeking liaisons. On the site, she meets the charming Ben, who pursues her after they learn they share mutual love of TV series Upton Rectory.
Meanwhile, Bart and Homer obtain a small steam train from the now closed down Itchy & Scratchy Land.