What's in the Attic?
S08E01 - Treehouse of Horror VII
"The Thing and I"
Bart and Lisa begin to hear strange noises coming from the attic. Homer claims not to know what they are talking about, even though he is seen heading into the attic with a bucket of fish heads. Bart and Lisa investigate, and discover there really is a monster. Homer and Marge go into the attic, and discover that the creature has escaped, prompting Marge to call Dr. Hibbert. He explains that Bart has a twin brother named Hugo. The two were separated at birth, but it was discovered that Hugo was too evil to live in society, so the Simpsons kept him chained in the attic, where Homer fed him a bucket of fish heads once a week. The rest of the family leaves to find Hugo, leaving Bart behind, but he discovers that Hugo never left the house. Hugo takes Bart to the attic and ties him up, so that he can reattach himself, but Dr. Hibbert bursts in and knocks out Hugo. He then realizes that Hugo's scar is on the wrong side, and Bart is the evil twin. In an attempt to correct their wrong, Dr. Hibbert and the Simpson family sit down to a turkey dinner with Hugo, leaving Bart locked in the attic.
"The Genesis Tub"
Lisa performs a science experiment to see if cola will dissolve a tooth, and Bart shocks Lisa as part of his project to prove that nerds conduct electricity. The tooth is also shocked; it undergoes an unusual reaction and creates a race of miniature beings. Lisa discovers this the next day and marvels at how the people in her universe evolve at a rapid rate. Bart destroys some of the ecosystem in Lisa's tub universe, and the people respond by sending a squadron of space ships to attack him. Lisa is shrunk and beamed down into the tub, where the citizens explain that they regard her as God, and they want her to do something about Bart, whom they regard as the Devil. She says she can help them if they unshrink her, but they tell her they have not figured out the technology to do that. Bart grabs the tub and submits it in the science fair, and Lisa is forced to watch from within as Bart wins first prize. Realizing that she is now stuck in the small universe forever, Lisa orders her citizens to grovel and bring her some shoes.
While out fishing, Homer is abducted by the two aliens, Kang and Kodos. When they demand that Homer point them towards Earth's leader, Homer informs them of the upcoming presidential election and says the winner could be either Bill Clinton or Bob Dole. Kang and Kodos kidnap both Dole and Clinton, placing them in suspended animation tubes and assuming their forms through "bio-duplication" to ensure that one of them will become the next leader. Before returning Homer to Earth, the aliens soak him in rum, so nobody will believe him. As the election nears, the impostor candidates are seen to be acting strangely, holding hands in public and making bizarre declarations in unhumanlike monotone. Later on, Homer stumbles upon the badly hidden spaceship and tries to save Dole and Clinton, with both candidates agreeing they should join forces to defeat the aliens; however, Homer accidentally ejects them into space. On the day before the election, Homer crashes the spaceship into the Capitol and reveals the candidates' real identities. However, despite being exposed, Kang and Kodos declare to the people that they still have to choose one of them because it is too late to get new candidates. Kang is subsequently elected president and enslaves all of humanity.