
The Simpsons' twenty-first season aired on Fox from September 27, 2009 to May 23, 2010. It was the first of two seasons that the show was renewed for by Fox, and also the first season of the show to air entirely in high definition. With this season, The Simpsons established itself as the longest-running American primetime television series surpassing Gunsmoke. The season received mainly positive reviews from critics, with many praising "The Squirt and the Whale", "To Surveil with Love" and "The Bob Next Door". The show moved up 16 positions in the Nielsen ratings from the previous season and received numerous award nominations, winning two - an Emmy Award for Anne Hathaway for her voicing in "Once Upon a Time in Springfield", and an Annie Award for "Treehouse of Horror XX".
Name | The Simpsons Season 21 |
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Air Date | September 27th, 2009 |
Genres | Animation, Comedy |
Network | FOX |
Production Companies | The Curiosity Company, Gracie Films, 20th Century Fox Television |
Number of Episodes | 23 Episodes |
Plot Keywords | mother, baby, alcohol, cat, brother, clown, house, housewife, beer, satire, father, nuclear power plant, parody, middle class, sister, dysfunctional family, teacher, social satire, neighbor, school, dummy, dog, donuts |














Episodes List
The Simpsons Season 21 Episode 1 : Homer the Whopper
September 27th, 2009Homer 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 superh...
The Simpsons Season 21 Episode 2 : Bart Gets a 'Z'
October 4th, 2009"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...
The Simpsons Season 21 Episode 3 : The Great Wife Hope
October 11th, 2009The men and boys in Springfield become obsessed with Ultimate Punch Kick and Choke Championships, a violent sport where fighters inflict severe pain o...
The Simpsons Season 21 Episode 4 : Treehouse of Horror XX
October 18th, 2009Dial "M" for Murder or Press "#" to Return to Main Menu- Lisa is forced into a Hitchcockian murder scheme by Bart. Don't Have a Cow, Mankind- Springf...
The Simpsons Season 21 Episode 5 : The Devil Wears Nada
November 15th, 2009Marge 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...
The Simpsons Season 21 Episode 6 : Pranks and Greens
November 22nd, 2009Principal 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 Ha...
The Simpsons Season 21 Episode 7 : Rednecks and Broomsticks
November 29th, 2009"Rednecks and Broomsticks" is the seventh episode of the twenty-first season of the American animated television series The Simpsons. It aired on the ...
The Simpsons Season 21 Episode 8 : O Brother, Where Bart Thou?
December 13th, 2009One 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...
The Simpsons Season 21 Episode 9 : Thursdays with Abie
January 3rd, 2010Grampa 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 lif...
The Simpsons Season 21 Episode 10 : Once Upon A Time In Springfield
January 10th, 2010Krusty grudgingly adds a pretty, singing cohost named Princess Penelope to his show in order to attract more female viewers. Girls love her, and ratin...
The Simpsons Season 21 Episode 11 : Million Dollar Maybe
January 31st, 2010Homer 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 reaso...
The Simpsons Season 21 Episode 12 : Boy Meets Curl
February 14th, 2010Homer takes Marge out for a romantic evening of ice skating and hand-holding, but upon entering the rink, they encounter a curling team practising. Ma...
The Simpsons Season 21 Episode 13 : The Color Yellow
February 21st, 2010When Miss Hoover asks her students to research their family history, Lisa is horrified to discover that most of her ancestors were bad people – a mo...
The Simpsons Season 21 Episode 14 : Postcards from the Wedge
March 14th, 2010When 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...
The Simpsons Season 21 Episode 15 : Stealing First Base
March 21st, 2010Principal Skinner announces that Mrs. Krabappel was called out of town and budget cuts dictate that, until she returns, the school's two fourth grade ...
The Simpsons Season 21 Episode 16 : The Greatest Story Ever D'ohed
March 28th, 2010"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 netw...
The Simpsons Season 21 Episode 17 : American History X-cellent
April 11th, 2010When 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 Simpsons Season 21 Episode 18 : Chief of Hearts
April 18th, 2010Homer is completing his court-ordered community service when he befriends his supervisor, Chief Wiggum, by offering him one of his sandwiches. Touched...
The Simpsons Season 21 Episode 19 : The Squirt and the Whale
April 25th, 2010The 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...
The Simpsons Season 21 Episode 20 : To Surveil With Love
May 2nd, 2010A bomb squad mistakenly blows up Homer's unattended gym bag, releasing radiation into the city and authorities react by suspending civil liberties. Wi...
The Simpsons Season 21 Episode 21 : Moe Letter Blues
May 9th, 2010As 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 chi...
The Simpsons Season 21 Episode 22 : The Bob Next Door
May 16th, 2010Bart becomes convinced that his new neighbor, Walt, is his archenemy, Sideshow Bob, disguised and back for revenge. But when Marge tries to convince B...
The Simpsons Season 21 Episode 23 : Judge Me Tender
May 23rd, 2010When 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 ...