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Watch The Simpsons Season 21 full episodes online, free and paid options via our partners and affiliates.
After judging local events in Springfield, Moe gets sent to Los Angeles to join the cast of American Idol judges.
When the Simpsons get a new neighbor with a familiar voice, Bart swears it's his old nemesis, Sideshow Bob, but no one believes him.
While on a Krusty day cruise, Homer, Reverend Lovejoy and Apu all get a letter from Moe saying he's running off with one of their wives.
After Homer's Duff duffel bag gets blown up with hazardous materials in it, the town gets retrofitted with surveillance cameras on every corner.
Homer installs a wind turbine behind his house; Lisa becomes attached to a beached whale.
Homer gets stuck doing community service and bonds with Chief Wiggum; Bart becomes obsessed with a Pokemon-style battle balls game.
When Mr. Burns ends up in jail for stealing art work, Smithers ends up running the power plant.
Ned takes Homer and family to Israel where Homer has an epiphany and thinks he's the Messiah.
Bart ends up stealing a kiss from a girl at school, Nikki (guest voice Sarah Silverman); Michelle Obama comes to visit Lisa.
To get out of homework, Bart pits Marge against Homer and puts their marriage in danger.
During Black History Month, Lisa reads the story of her ancestor, Eliza Simpson, who helped a slave, Virgil, escape on the underground railroad.
Homer, Marge partner with Seymore and Agnes Skinners to make it to the Olympics for curling; Lisa becomes addicted to collecting pins.
Homer wins the lottery but can't tell Marge because he bought the ticket when he was supposed to be at a wedding with her.
In the 450th episode of The Simpsons, the onstage and behind-the-scenes rapport between Krusty and his new female sidekick Princess Penelope (guest voice Anne Hathaway) grows.
Marshall, a human interest journalist, writes a weekly column about Abe's stories; Bart takes Larry the Lamb on an adventure.
Episode recap to come after "O Brother, Where Bart Thou?" airs.
Lisa tries to join some Wiccans but when they're busted by Wiggum, she serves as the chief witness; Homer hangs out with Cletus after discovering he makes moonshine.
Principal Skinner tells Bart about Andy Hamilton, a former student that was a better prankster than Bart. Bart tracks down the 19 year old and they become friends.
To raise money for her charity, Marge and the "Philanthro-Chicks" calender. Although reluctant at first, the photographer loosens her up and before long she's the talk of the town.
The annual Halloween special for the Simpsons is broken into three stories: Dial "M" For Murder; Don't Have a Cow, Mankind; and The Musical.
The men of Springfield all become obsessed with a MMA and Marge begins to protest the show. The creator of the sport agrees to take it off the air if she can defeat him in a fight.
Bart spikes Mrs Krabappel's coffee with alcohol, getting her fired. Though he feels guilty, Bart loves his cool new teacher Mr. Vaughn.
In the twenty first season premiere, written by Seth Rogen, Comic Book Guy's comic, Everyman, becomes popular and it's made into a movie. Homer is cast as the lead role, but struggles staying in shape for the role.