Critical opinion of the episode was mixed, with "Tweenlight" generally being regarded as the best of the three segments. In its original airing on the Fox Network during the November sweeps period, the episode had a 3.7 Nielsen rating viewed in approximately 8.2 million homes. The episode also contains references to The Office, A Clockwork Orange and Sesame Street. The first segment references Jumanji, the second is a loose parody of Dead Calm and the third satirizes the Twilight novel and film series. Daniel Radcliffe and Hugh Laurie both guest starred in the episode. The Simpsons is once again breaking new ground when it airs an all-musical episode to kick off its 33rd season. In the 30th season, Marge and Homer won their 1 million prize. "Treehouse of Horror XXI" was written by Joel H. The Simpsons - Season 30 Episode 04: Treehouse of Horror XXIX. This is the 21st Treehouse of Horror episode, and, like the other "Treehouse of Horror" episodes, consisted of three self-contained segments: In "War and Pieces", Bart and Milhouse discover a real-life board game that they must win to return home in "Master and Cadaver", Marge and Homer go on a honeymoon on a sailboat, and rescue a mysterious castaway named Roger and in "Tweenlight", Lisa falls in love with a vampire named Edmund.
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Matt Selman also contributed as showrunner for the episodes Heartbreak Hotel. It first aired on the Fox network in the United States on November 7, 2010. Al Jean returns as showrunner, a position he has held since the thirteenth season.
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"Treehouse of Horror XXI" is the fourth episode of The Simpsons' twenty-second season.