In "House of Whacks," Pierce Brosnan is the voice of UltraHouse 3000, a computer that runs the Simpsons' home. But this is no impersonal machine---it falls in love with Marge and tries to kill Homer.
In "Hex and the City," a curse from a tarot-reading gypsy gives bad luck to those Homer loves, resulting in bizarre physical transformations for his family. What's required to alter the curse, Homer believes, is a leprechaun.
In the finale, magic students Lisa and Bart are competing "Wiz Kids," with Bart seeking to best Lisa in the school talent by aligning with an evil duo (Burns and Smithers) who have a secret agenda.
After accidentally going for a joy ride in Chief Wiggum's patrol car, Bart has to appear in court. When Judge Snyder is about to let Bart off, a new judge (voiced by Malcolm in the Middle's Jane Kaczmarek) takes over and gives the sentence: Homer & Bart must be tethered together at all times.
Moe, yearning to visit his old bartending school, leaves Homer in charge of Moe's Tavern. When Moe returns, he gives the ol' bar a total facelift. Homer, not impressed, makes his own tavern out of his garage. R.E.M. guest star as themselves.
Homer gets a job writing fortune cookies. After Burns reads his fortune (about falling in love), he asks a middle-aged female 'roach coach' short-order cook to date him. Burns asks Homer to tag along, to prove to her he still hangs out with the 'young' crowd. After many dates, Snake shows up & wants to get back together with this cook, so he kidnaps her and Homer. Julia-Louis Dreyfus voices Burns' love interest.
A hypnotist accidently releases a childhood trauma within Homer. Flashback sequences of Homer, Carl, Lenny, and Moe when they were about 12 years old reveal a 25 year-old mystery that was never solved. Paul Newman has a small guest star role.
After Homer accidentally destroys the town church, Mr. Burns raises money to repair the damage by selling the naming and seating rights to corporate sponsors. Disgusted by that crass commercialism, Lisa decides to test out new religions, (mainly Buddhism) but finds it hard to resist celebrating Christmas. Richard Gere guest-stars as himself.
Springfield is named the "fattest town on Earth" and Marge, after finding a surplus of sugar in the town's food, decides to put the entire family on a new diet. Ben Stiller guest stars as Garth Motherloving, the CEO of a sugar company.
When Homer suffers a broken jawbone, Dr. Hibbert wires his jaw shut to allow it to heal. Homer, unable to speak, is forced to listen to his family for the first time ever. To everyone's surprise, Homer is quite good at listening to their problems and concerns, and soon The Simpsons find themselves living in harmony...that is until the wires come off.
Jon Lovitz lends his voice in a wild parody of the 1993 film "Indecent Proposal."
Lovitz plays Marge's one-time prom date Artie Ziff, a nerd who turned Marge off when he turned all-hands. Now, a techno-invention has made him rich. Encouraged by her sisters, and some girls-night imbibing, Marge e-mails Artie, who responds by helicoptering onto the Simpsons' lawn and inviting the family to his yacht. There, he makes his proposition: one million bucks to spend a weekend alone with Marge. And Artie promises "no funny stuff." The Simpsons agree when they realize the money will help their marriage---by paying for an operation to cure Homer's snoring.
Reese Witherspoon and Wolfgang Puck are guest voices as Bart and Milhouse fight over a girl.
The object of their affection---and altercation---is Greta Wolfcastle (Witherspoon), the daughter of action-film star Rainier Wolfcastle. After Bart and his slingshot rescue her backpack from bullies, Greta is immediately smitten. But her crush is unrequited, and the oblivious Bart blows off a date with her in order to harass Principal Skinner at his stand-up comedy debut. Clued to Greta's feelings, Bart breaks off the relationship---until Milhouse steps in. It's only then, in the name of love, that Bart asks his parents' help to win Greta back by following her to her dad's film set...in Toronto.
Dennis Weaver, whose nearly 50-year career on TV includes Gunsmoke, McCloud and Gentle Ben, provides the voice of Buck McCoy, an old cowboy star who becomes Bart's new hero.
They first meet after a stray dog chases Bart onto the grounds of Buck's mansion. Bart becomes pals with the horse-opera great, who later visits the Simpsons and brings along video highlights of his career. With Bart's help, it's not long before a Western craze sweeps Springfield Elementary, and he and Lisa land Buck a guest spot on Krusty the Clown's TV show. This could be Buck's big shot at a comeback, but it's not only his career that's in need of rehabilitation."
When a sultry new woman Zelda (guest star Olympia Dukakis), takes up residence in Grampa Simpson's retirement home, he becomes determined to win her affections by impressing her with his driving skills. Grampa convinces Homer to let him borrow the car, and proceeds to make a mess of the town's roads. This only drives Zelda into the arms of another man, so Grampa turns to Bart for help.
When Marge is ready to cut the cords of the phone company for charging for calls her family did not make, Lisa confesses to calling Brazil to check on her sponsored orphan. This spurs a family vacation to Rio de Janeiro, where Homer is swept away and Lisa discovers that her penniless orphan has actually managed quite well.
When his eyes are pecked by crows (don't ask), Homer begins smoking marijuana for medicinal purposes. The pot smoking does wonders for Homer's professional life and he's even promoted (while high) for laughing at Mr. Burns' jokes.
Flanders, meanwhile, leads an initiative to re-criminalize marijuana, which leads to a rally - at which rockers Phish play their hearts out. The band performs "Run Like an Antelope" off 1991's Lawn Boy as well as a few bars of the Simpsons theme at the rally.
The Springfield Friars Club roasts Homer, with emcee Krusty the Clown introducing friends, family and their memories from past episodes. This episode was written by Dan Castellaneta and his wife, Deb Lacusta.
Apu's unbearable life of work and eight kids drives him to have an affair with another woman, and when Manjula finds out and files for divorce, Apu will have to do everything it takes to win her back, with the help of Marge and Homer. James Lipton has a guest role.
Lisa uses her newly found gymnastics skills to pose as a college student. Meanwhile, Bart is relegated to living in a bubble after he is bitten by a contagious Chinese mosquito. Robert Pinksy guest stars.
As a gift, Homer gets a beautiful pond put in their backyard for Marge. Soon, he kills an endangered "screamapillar", and is forced by the authorities to do community service to make up for the incident. Marge volunteers to take some blame, and helps too. Homer and Marge work for an old woman who eventually turns up dead, leaving Homer and Marge as suspects. Homer and Marge get hauled off to jail, as Bart and Lisa are left with foster parents, Cletus and Brandine. Homer eventually takes all the "blame", so Marge will be free. However, Homer lands on death row. Both Carmen Electra and Frances Sternhagen guest star.
Homer becomes Springfield's top cop in the 13th-season finale, an episode that draws inspiration from both The Sopranos and "High Noon."
The latest addition to Homer's résumé (recited by Mr. Simpson in a litany of past labors) comes on the heels of a heat wave that sparked a riot. The incident (in which Homer played an inadvertent role) exposes the inadequacies of Chief Wiggum and his men. Losing all confidence in the local constabulary, Homer forms his own security company---SpringShield---which subsequently replaces the police when the mayor catches Wiggum in yet another embarrassing situation. But the new chief is quickly tested when he runs afoul of mobster Fat Tony.