Category:Season 21

The Simpsons twenty-first season, this season will pull ahead of Gunsmoke as the longest running American primetime television series. It will air on September 27, 2009.

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Episodes

1. "Homer the Whopper" September 27 2009 - LABF13
2. "Bart Gets a "Z"" October 4 09 - LABF15
3. "The Great Wife Hope" October 11 2009 - LABF16
4. "Treehouse of Horror XX" October 18 2009 - LABF14
5. "The Devil Wears Nada" November 15 2009 - LABF17
6. "Pranks and Greens" November 22 2009 - LABF18
7. "Rednecks and Broomsticks" November 29 2009 - LABF19
8. "O Brother, Where Bart Thou?" December 13 2009 - MABF01
9. "Thursdays with Abie " - MABF02

• ?? "Once Upon a Time in Springfield"  - LABF20
• ?? "Million Dollar Maybe" - MABF??
  
• ?? "The Greatest Story Ever D’ohed" March 28 2010 - MABF??

Know Titles

• LABF?? - "Old King Clancy"
• LABF?? - "Kids in Singapore"

Known Plots & Guest Stars

• Jonah Hill will guest star in "Pranks and Greens" as an adult named Andy, who was a former Springfield Elementary student and was the best prankster during his day.
• "Treehouse of Horror XX," the twentieth Treehouse of Horror episode, will air in 2009. It will include a segment that features elements of the films 28 Days Later and Children of Men where Krusty the Clown serves hamburgers made from "mad cows" and turns the citizens of Springfield into zombies. The two other stories see Bart and Lisa become involved in a murder scheme, and Homer's blood becomes a secret ingredient in a new beer brewed by Moe. The opening sequence will feature a parody of the 1960 film Psycho.
• Neve Campbell will guest star in "Rednecks and Broomsticks" as a Wiccan called Cassandra who the townspeople believe has cursed them.
• An episode in February to coincide with the 2010 Winter Olympics will feature Marge and Homer taking up curling and participating in a mixed-doubles event with the Skinners.
• Anne Hathaway will return to the show in the episode "Once Upon a Time in Springfield", this time voicing an actress playing Princess Penelope drafted in to the Krusty the Clown Show to generate more young, female viewers and ends up in a relationship with Krusty. Jackie Mason will return to voice Krusty the Clown's father Rabbi Hyman Krustofski. Eartha Kitt also recorded a role before her death in December 2008.
• Chris Martin will guest star in an episode which sees Homer win the lottery and hire Martin and the rest of Coldplay to play for him and Bart.
• Sarah Silverman will play Bart's new girlfriend "who alternately loves him and hates him for no reason."
• Gary Larson, Jordan Nagai, the Smothers Brothers, Peyton Manning, Eli Manning and Cooper Manning, Bob Costas, Chuck Liddell and Angela Bassett are to guest star in yet to be announced episodes.