Treehouse of Horror XX
"Treehouse of Horror XX" is the fourth episode of the twenty-first season of the American animated television series "The Simpsons". It first aired on the Fox network in the United States on October 18, 2009. This is the twentieth "Treehouse of Horror" installment, containing three self-contained stories: In "Dial 'M' for Murder or Press '#' to Return to Main Menu", Lisa is forced into a Hitchcock-esque murder scheme by Bart; in "Don't Have a Cow, Mankind", Springfield is once again overrun by zombies thanks to Krusty Burger's latest sandwich; and in the   parody, "There's No Business Like Moe Business", Moe the Bartender bleeds Homer dry to create the perfect microbrewed beer. This is the first "Treehouse of Horror" episode to air in the month of October since "Treehouse of Horror X" in 1999. An estimated 8.59 million viewers tuned in to watch the episode. Plot. Opening. Traditional horror movie characters such as Frankenstein's Monster, the Mummy, the Wolf Man, and Dracula roam the streets of Springfield on Halloween night. After they are teased by Dolph, Jimbo, and Kearney, they get new, more modern costumes from a Halloween store. They then  go to an adult Halloween party thrown by Homer and Marge, but are soon confronted by their wives, who are angry that their husbands lied about going out to kill children tonight. Homer tries to intervene as the wives begin to assault their husbands, only to be decapitated, and his eyes are then replaced with two red x's, the title of the episode then appears onscreen. Dial "M" for Murder or Press "#" to Return to Main Menu. In a parody of Alfred Hitchcock's films, Lisa wants revenge after being sent to detention by Ms. Hoover for disrupting class  as she claims another student topped her through a tutor. Bart hatches a "criss-cross" plan and tells Lisa that if she pulls a "ding-dong ditch" on Mrs. Krabappel, he will do the same to Ms. Hoover. Lisa thinks this means ringing the bell at Mrs. Krabappel's apartment and leaving. However, Lisa soon learns that Bart meant for her to kill Mrs. Krabappel (and dump the corpse in a ditch), as he has killed Ms. Hoover. Bart attempts to coax Lisa into killing Mrs. Krabappel with a paper cutter, but she refuses. Eventually, Bart decides to blackmail her  into it with help from Willie, who would frame Lisa for the decapitated Skinner to honor his side of the "criss-cross" in which Bart killed Skinner. Realizing that Bart would frame her for these incidents, Lisa tricks him into believing that she was submitting at his will only to get a knife from his hands and attempts to kill Bart in self-defense, beginning a chase sequence. Bart finally finds shelter at a crowded playground carousel, but is left at Lisa's mercy when the other children leave to get ice cream. Lisa, however, recognizing that she would not  be better than Bart, says she will never be a murderer, and attempts to throw the knife away. The knife cycles out of control and ends up nailing Bart in the head just as Mrs. Krabappel appears, pleased at his death. Despite her shock for accidentally killing Bart, Lisa agrees that it is better this way and she and Krabappel walk away smiling, leaving the murdered Bart to spin around on the carousel. Don't Have a Cow, Mankind. Krusty the Clown introduces a new version of his Krusty Burger, the Burger, made from cattle that have eaten other cattle  in their feed. Upon eating a burger on live television, Kent Brockman begins to comment on the taste before turning gray, red-eyed, and cannibalistic, starting a chain reaction of people getting attacked and eaten. Twenty-eight days later, Springfield has become overrun by zombies called munchers. The Simpsons are established to be one of the few survivors. One day, Bart, tired of eating fruit, escapes from his family's barricaded house and eats one of the tainted burgers, but turns out to be immune to its effects. Over the phone, a besieged Dr. Hibbert tells them that Bart's  immunity may be the key to developing a cure to the muncher epidemic and that they must bring Bart to a so-called "safe zone" being established in Shelbyville. The Simpsons are attacked after a failed attempt to sneak out but are saved by Apu, driving an armored off-road truck. Apu explains that he was never infected because, as a vegetarian, he did not eat any of the tainted beef, and as a convenience store owner, he is "armed to the teeth" (with a large arsenal of military-grade firearms). The group tries to leave Springfield, but Apu crashes  the truck on top of a pile of smashed cars at the edge of town. Apu goes to push the car off the pile, but the Simpsons drive away thinking Apu sacrificed himself, when he actually wanted the Simpsons to wait for him. After Apu is killed by the munchers, the Simpsons drive on but run out of gas in the middle of the highway, walking the remaining 20 miles to the safe zone. During their journey, Homer is bitten by Mr. Burns, thus turning him into a muncher himself. The family decide not to kill him in the hopes  of finding a cure. They reach the safe zone, where Bart, being immune to the virus, is worshiped as the "chosen one". However, the people there believe that cannibalizing Bart will save them from the virus. The Simpsons think of another solution: vaccinating the remaining populace (except Homer who either refuses to get cured or Bart refused to cure him as payback for being abusive to him earlier) by having Bart bathe in their food before eating it. There's No Business Like Moe Business. In a parody of "", presented as a stage musical, Moe is lonely and upset that  he does not have a girlfriend and is jealous when he sees Homer and Marge together. When Homer falls into the basement of the bar and is impaled by the microbrew pipes, his blood becomes the secret ingredient in Moe's new beer. Everyone loves this new beer, saying that it makes them feel warm, secure and cozy on the inside. Moe uses this to his advantage and woos Marge, tricking her into thinking that Homer came out of the closet as gay and left Marge, when in reality, Homer is slowly dying from losing blood. Homer emerges, alive, despite  being impaled by Moe's microbrew machine, hurls Moe (represented as a dummy) across the room, and reunites with Marge. Ending. The whole audience except for Kang and Kodos gathers onstage and conclude the episode by singing "Number XX" when Kang then shushes the audience, gesturing at Kodos, who has fallen asleep with the playbill over his helmet. Cultural references. The first segment includes parodies of the Alfred Hitchcock films "Psycho", "Strangers on a Train", "North by Northwest", and "Spellbound", as well as a reference to the film "Vertigo" (in particular the "Vertigo effect"). The main theme from "Psycho" by  Bernard Herrmann is used extensively during the first part. The title of the segment takes its name from the film "Dial M for Murder". The second segment is a parody of the 2002 British horror film "28 Days Later" and also contains references to "Children of Men" and "I Am Legend". The title of the segment takes its name from Bart's catchphrase, "Don't have a cow, man". The title of "There's No Business Like Moe Business" is a parody of the song "There's No Business Like Show Business" from "Annie Get Your Gun". The episode was  inspired by the 2007 film "". Reception. In its original American broadcast, "Treehouse of Horror XX" was watched by 8.59 million viewers and was the most watched of Fox's "Animation Domination", ahead of "American Dad!" and "The Cleveland Show". The show was the fourth most watched episode on Fox after "House", "The OT", and "Family Guy" in the 18/49 rating. Robert Canning of IGN praised the episode, saying "it was a fine addition to the series' Halloween specials". He enjoyed all of the stories, and said that the "Sweeney Todd" segment was "a nice treat". He also said that the  airing of this Treehouse of Horror episode before Halloween, the first time that this had happened in ten years, "[had to] count for something". Screen Rant called it the best episode of the 21st season. The episode won an award for "Best Writing in a Television Production" at the 37th Annie Awards.