Season 21

443
S21E01
Homer the Whopper
Homer gets the lead in a movie about a superhero who can take on the powers of every superhero in any comic book he touches. To whip Homer into superhero shape, the studio hires a celebrity fitness trainer.
September 27, 2009
444
S21E02
Bart Gets a 'Z'
"Bart Gets a 'Z'" is the second episode of The Simpsons' twenty-first season. It originally aired on the Fox network in the United States on October 4, 2009.
October 4, 2009
445
S21E03
The Great Wife Hope
The men and boys in Springfield become obsessed with Ultimate Punch Kick and Choke Championships, a violent sport where fighters inflict severe pain on each other.
October 11, 2009
446
S21E04
Treehouse of Horror XX (20)
Dial "M" for Murder or Press "#" to Return to Main Menu- Lisa is forced into a Hitchcockian murder scheme by Bart.
October 18, 2009
447
S21E05
The Devil Wears Nada
Marge and a group called the "Charity Chicks" pose for a calendar in hopes of raising money for charity, but Marge becomes the talk of the town thanks to her racy poses. Meanwhile, Carl is chosen as the newest supervisor at the nuclear power plant, and hires Homer to be his personal assistant.
November 15, 2009
448
S21E06
Pranks and Greens
Principal Skinner is getting fed up with Bart's pranks, so he informs Bart that he is not the best prankster after all. A former student named Andy Hamilton is hailed as the best prankster, and Bart sets out on a mission to track Andy down.
November 22, 2009
449
S21E07
Rednecks and Broomsticks
"Rednecks and Broomsticks" is the seventh episode of the twenty-first season of the American animated television series The Simpsons. It aired on the Fox network in the United States on November 29, 2009.
November 29, 2009
450
S21E08
O Brother, Where Bart Thou?
One snowy day in Springfield, Lisa informs Bart that she and Maggie share a bond that Bart will never understand because he doesn't have a brother, so Bart asks Homer for a baby brother. When Homer denies Bart's request, Bart makes his way to the Springfield Orphanage to find what he thinks he's missing.
December 13, 2009
451
S21E09
Thursdays with Abie
Grampa is sitting on a bench waiting for his family when a thoughtful-looking man named Marshall Goldman approaches him and asks to hear about his life. Grampa tells Goldman about the time he was on a World War II battleship.
January 3, 2010
452
S21E10
Once Upon A Time In Springfield
Krusty grudgingly adds a pretty, singing cohost named Princess Penelope to his show in order to attract more female viewers. Girls love her, and ratings improve, but Bart and Milhouse want to get the show back to the way it was.
January 10, 2010
453
S21E11
Million Dollar Maybe
Homer blows off Marge to buy a lottery ticket and winds up winning the million-dollar jackpot. Fearing how Marge will react if she finds out the reason Homer missed their date.
January 31, 2010
454
S21E12
Boy Meets Curl
Homer takes Marge out for a romantic evening of ice skating and hand-holding, but upon entering the rink, they encounter a curling team practising.
February 14, 2010
455
S21E13
The Color Yellow
When Miss Hoover asks her students to research their family history, Lisa is horrified to discover that most of her ancestors were bad people – a motley crew of horse thieves and deadbeats.
February 21, 2010
456
S21E14
Postcards from the Wedge
When Bart fails to turn in his homework, Mrs. Krabappel sends a letter home about Bart's behaviour. Despite Bart's best efforts to intercept it, Homer reads the letter, and he and Marge visit Principal Skinner for a parent-teacher conference.
March 14, 2010
457
S21E15
Stealing First Base
Principal Skinner announces that Mrs. Krabappel was called out of town and budget cuts dictate that, until she returns, the school's two fourth grade classes will merge.
March 21, 2010
458
S21E16
The Greatest Story Ever D'ohed
"The Greatest Story Ever D'ohed" is the sixteenth episode of The Simpsons' twenty-first season and the 457th episode overall. It aired on the Fox network in the United States on March 28, 2010.
March 28, 2010
459
S21E17
American History X-cellent
When the police are called to diffuse a rowdy crowd at Mr. Burns' estate, one of the officers recognizes priceless stolen paintings on the walls, and the maniacal billionaire is taken downtown for questioning.
April 11, 2010
460
S21E18
Chief of Hearts
Homer is completing his court-ordered community service when he befriends his supervisor, Chief Wiggum, by offering him one of his sandwiches.
April 18, 2010
461
S21E19
The Squirt and the Whale
The Simpsons decide to embrace a cheaper, alternate source of energy by erecting a wind turbine in their backyard. But when Homer realizes some of the power is being directed to the local electric company.
April 25, 2010
462
S21E20
To Surveil With Love
A bomb squad mistakenly blows up Homer's unattended gym bag, releasing radiation into the city and authorities react by suspending civil liberties.
May 2, 2010
463
S20E21
Moe Letter Blues
As Mother's Day approaches, Moe narrates an episode in which he writes a letter to Homer, Apu and Reverend Lovejoy, who are vacationing with their children, and threatens to run away with one of their wives.
May 9, 2010
464
S20E22
The Bob Next Door
Bart becomes convinced that his new neighbor, Walt, is his archenemy, Sideshow Bob, disguised and back for revenge. But when Marge tries to convince Bart otherwise by taking him to visit the state penitentiary, a disturbing truth is revealed.
May 16, 2010
465
S20E23
Judge Me Tender
When Moe discovers a hidden talent for judging contests, he is approached by a television agent to join the AMERICAN IDOL judges' panel. Moe flies to Los Angeles where he tours the Fox lot and receives some sage career advice. Meanwhile, Homer drives Marge crazy when he begins hanging around the house.
May 23, 2010