"Treehouse of Horror XXIII" is the second episode of the twenty-fourth season of the American animated television series The Simpsons. The episode was directed by Steven Dean Moore and written by David Mandel and Brian Kelley. It first aired on the Fox network in the United States on October 7, 2012. In the United Kingdom and Ireland, the episode aired on Sky 1 on March 24, 2013 with 1,312,000 viewers, making it the most watched program that week. The episode received an Emmy nomination for Outstanding Animated Program.
Plot
Opening sequence
At the height of the Maya civilization, in the city of Chichen Itza, a sacrifice is about to take place to prevent the end of the world from happening at the end of the 13th Baktun and the Mayan Calendar. A Mayan Homer, who has been fattened up, showing that he is ready to be sacrificed, hears about it for the first time (as he did not pay attention during orientation) and attempts to back out to no avail. However, his wife, a Mayan Marge, tricks a priest, a Mayan Moe, into getting himself sacrificed instead by promising him sex. After the sacrifice, a Mayan Professor Frink confirms that the world will end after the 13th Baktun, which, accounting for the Gregorian calendar and the birth of Jesus, puts the end of days in the year 2012 (with the Mayan Mayor Quimby placing the blame on President Barack Obama).
In the present, Homer encounters three Mayan stone gods, mistaking them for the trick-or-treaters. One of them crushes Homer underfoot, then the second one jumps on Flanders' house. The stone trio start to wreak havoc on Springfield and the Earth with one stone god throwing fireballs at Springfield City Hall and throwing Lard Lad's donut at a UFO and then taking this to popular landmarks like moving the Eiffel Tower to crash it into Big Ben, ripping up the Great Wall of China; causing it to sink to a river of lava, making George Washington's head kiss Abraham Lincoln's head in Mount Rushmore; causing rivers of lava to appear, and splitting Earth into large fissures. Once their destruction is done, they high five to show their success on wreaking havoc in Earth, then fly off, only leaving the Earth to explode, replacing it with what appears to be the Earth's infrastructure or blood. The text reads the title of the episode.
The Greatest Story Ever Holed
The citizens of Springfield gather to witness the activation of the Springfield Particle Accelerator; they originally wanted to use the money to build a new baseball stadium, but Lisa convinced them otherwise. Professor Frink activates the machine and it works, but nothing exciting happens, and everyone blames Lisa for her suggestion. When everyone is gone, two particles collide with each other and create a small black hole which floats off. Lisa finds it, and after it sucks up Ralph and Nelson, she takes it home so that it will not cause any more trouble. The Simpsons put it in the basement and Lisa warns them not to throw anything in it or otherwise it will grow bigger. Despite the warning, Homer, Bart and Marge use it as a trash disposal, with Santa's Little Helper using it off-camera to get rid of Snowball II, and Homer even opens a business allowing people to throw their junk into it. The black hole becomes huge and consumes everything in sight. The only person who is not sucked in is Maggie, whose pacifier flies into the black hole, inexplicably stopping it. Meanwhile, all of Springfield has been warped to an alternate universe, where aliens worship their trash.
Un-normal Activity
In a Paranormal Activity homage, when strange events occur at the Simpson house, Homer sets up cameras to photograph what is haunting them. The culprit is revealed to be a Moe-like demon with whom Marge made a deal to save her sisters when they summoned the demon as part of a Satanic ritual. As part of the deal, the demon would return 30 years later to take Marge's favorite child as payment (which turns out to be Maggie, much to Lisa's shock). Homer manages to convince the demon to relinquish the bargain in return for Homer to reluctantly engage in three-way sex with him and another demon. After learning that the safe word is cinnamon, Homer throws his robe over the camera saying he'd like to try something and the Moe-like demon is heard yelling 'cinnamon'.