This episode is considered non-canon and the events featured do not relate to the series and therefore may not have actually happened/existed
"Treehouse of Horror XXV" is the fourth episode of Season 26, and it is the 25th annual Treehouse of Horror episode.
School is Hell - Bart and Lisa are transported to a demon-filled alternate universe after Bart reads a set of Aramaic symbols he finds on a desk.
A Clockwork Yellow - Moe's "Clockwork Orange"-style gang is disrupted when Dum (Homer) falls for a girl (Marge) who wants him to give up the thug life.
The Others - The Simpsons family are haunted by a family of ghosts, which turn out to be the family from the Tracey Ullman shorts, who were murdered and buried under the house.
Kang and Kodos are hosting a TV special, in which all of the celebrity guests have been tortured and mutilated.
School is Hell
Principal Skinner has put Bart in detention, and while dusting a desk Bart finds an Aramaic inscription. Lisa uses an app to translate it, which transports the pair to Hellroads, which is a school in the Burning Hells. Bart excels in the diabolical subjects and asks his parents if he can study there permanently. Bart succeeds in all of his classes in Hell. For his final test, he must torture Homer. Despite Bart's hesitation, Homer lets him. A disfigured Homer proudly watches Bart graduate as valedictorian.
A Clockwork Yellow
Moe has a Clockwork Orange-style gang in London along with Lenny, Carl and Homer. Homer falls for a girl (Marge) who convinces him to quit, and the gang falls apart. Years later, Moe is attacked at home in a style similar to his gang's former ways, and asks Homer to bring the gang back together. Lenny and Carl, who have become policemen, join them. They attack a masked orgy, similar to the Stanley Kubrick film Eyes Wide Shut, and several other of his films are parodied in a fight sequence. Kubrick is then shown in an editing room and asks for the entire film to be reshot.