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The Simpsons' twenty-first season pulled ahead of "Gunsmoke" as the longest running American primetime television series 1989-2012. It aired on September 27, 2009 and ended on May 23, 2010.

Episodes

Image # Original airdate Prod. Code Title Title Reference
Homerthewhopper 1 - 2101 September 27, 2009 LABF13 "Homer the Whopper" Home of the Whopper
Zacharyvaughn 2 - 2102 October 4, 2009 LABF15 "Bart Gets a "Z"" Bart Gets an "F"
Greatwifehopebanner 3 - 2103 October 11, 2009 LABF16 "The Great Wife Hope" The Great White Hope
Treehouse of Horror 4 - 2104 October 18, 2009 LABF14 "Treehouse of Horror XX" N/A
The Devil Wears Nada 5 - 2105 November 15, 2009 LABF17 "The Devil Wears Nada" The Devil Wears Prada
Simp PranksandGreens v2F 6 - 2106 November 22, 2009 LABF18 "Pranks and Greens" Franks and Beans
Rednecks and Broomsticks 7 - 2107 November 29, 2009 LABF19 "Rednecks and Broomsticks" Bedknobs and Broomsticks
MABF01 8 - 2108 December 13, 2009 MABF01 "O Brother, Where Bart Thou?" [[wikipedia: O Brother, Where Art Thou?|O Brother, Where Art Thou
Thursdays with Abie 35 9 - 2109 January 3, 2010 MABF02 "Thursdays with Abie" Tuesdays with Morrie
OnceUponTimeInSpringfield 10 - 2110 January 10, 2010 LABF20 "Once Upon a Time in Springfield" Once Upon a Time in America
Promocold 11 - 2111 January 31, 2010 MABF03 "Million Dollar Maybe" Million Dollar Baby
Boymeetscurl2 12 - 2112 February 14, 2010 MABF05 "Boy Meets Curl" Boy Meets Girl
TheColorYellow 13 - 2113 February 21, 2010 MABF06 "The Color Yellow" The Color Purple
Postcards from the wedge 14 - 2114 March 14, 2010 MABF04 "Postcards from the Wedge" Postcards from the Edge
Stealing First Base 2 15 - 2115 March 21, 2010 MABF07 "Stealing First Base" N/A
The Greatest Story ever D'ohed 16 - 2116 March 28, 2010 MABF10 "The Greatest Story Ever D'ohed" The Greatest Story Ever Told
American History X-cellent 17 - 2117 April 11, 2010 MABF08 "American History X-cellent" American History X
Chief of Hearts 18 - 2118 April 18, 2010 MABF09 "Chief of Hearts" King of Hearts
TheSquirtAndTheWhale 19 - 2119 April 25, 2010 MABF14 "The Squirt and the Whale" The Squid and the Whale
ToSurveilWithLove 20 - 2120 May 2, 2010 MABF12 "To Surveil, with Love" To Sir, with Love
Moeletterblues 21 - 2121 May 9, 2010 MABF13 "Moe Letter Blues" Mo' Better Blues
The Bob Next Door 22 - 2122 May 16, 2010 MABF11 "The Bob Next Door" The Boy Next Door
Judge Me Tender promo 23 - 2123 May 23, 2010 MABF15 "Judge Me Tender" Love Me Tender
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