Opening sequence In a parody of
The Omen,
Homer and
Marge bring
Maggie home after trading her due to originally having a boy, and she shows satanic powers and torments the family and the other people of
Springfield.
Ned Flanders vows to get rid of the evil, sacrificing her inside the First Church of Springfield, but Homer and Marge stop him. Ned however shows them the
Mark of the Beast on her head,
Mickey Mouse's logo, in reference to the
Disney acquisition of Fox, and then reveals
666, parodying that this is the 666th episode. Maggie then kills all three of them, and the title for the episode appears, up top of the number of the beast 666 reads "episode" and below "or 667 if Fox changes the schedule".
"Danger Things" The plot is a parody of
Stranger Things season 1, featuring
Milhouse as
Will,
Bart as
Mike,
Nelson as
Dustin and
Lisa as
Eleven. The story takes place in the 1980s, where after a night of playing the
Atari 2600 game
E.T. the Extra Terrestrial, Milhouse gets kidnapped by a Demogorgon. A concerned
Kirk destroys his wall and creates a Christmas light alphabet communication device (akin to
Stranger Things) to look for his son. The device actually works when Milhouse in the Over Under (parody of the "Upside Down") uses it to send an SOS signal to his parents. Milhouse then calls the Simpson house with Lisa picking up. The latter goes to Starcourt Mall to find Bart and Nelson at the arcade. She tells them that Milhouse is still alive and in another dimension; Bart does not realize until Milhouse appears on the game he is playing. They decide to get help from Professor Frink to travel to the Over Under using a sensory deprivation device. As the device requires someone of high intelligence, a freshly-shaved bald Lisa volunteers and finds Milhouse in the other dimension. Whilst escaping, they find an alternate version of Springfield full of Demogorgons (with
Comic Book Guy and
Moe Szyslak). Lisa and Milhouse are surrounded by Demogorgons until Lisa uses her hidden psychic powers to get rid of the creatures. They are finally saved by Homer, who is working for
Mr. Burns's secret government program to find monsters; however he informs them that they are permanently trapped in the new dimension. Lisa is horrified until a Demogorgon informs her that there is affordable housing and excellent schools as well as local shops and restaurants. With this new information, the Simpsons decide to live in the Over Under. Homer is glad that Ned is not there until a Demogorgon version of Ned appears, causing Homer to burn him.
"Heaven Swipes Right" In a parody of
Heaven Can Wait, Homer,
Moe,
Lenny and Carl are watching the Springfield Atoms vs. Shelbyville Shelbyvillians football game at the Springfield Atoms Stadium when Homer ends up choking to death on a hotdog. Homer's soul arrives in
Heaven meets St. Greeter, who welcomes him with the pun on his name, but Homer does not forgive the pun so he gets damned to
Hell. Homer finds out
God sold Heaven to
Google, before discovering his soul was taken before his time, but cannot be sent back to Earth into his body due to the decay. Homer is given the option to live the life of a man who was going to die that day, so Homer chooses the body of Case Diggs, the new Atoms quarterback. He goes to Marge and she loves the new body, but he ruins it in one night by overeating. Bart and Marge convince him to try
Superintendent Chalmers as the next body. At
school, Homer makes
Principal Skinner give Bart all As and twists his nipple until it is deep purple. When Homer goes to Skinner's house, he discovers that he makes very little money as Superintendent, so Homer changes his body again. Marge has had enough and tells Homer he needs to settle in for one body and stop changing, so he chooses the body of the man that loves her as much as he does, Moe. However, Moe finds himself in Maggie's body and immediately tells Marge that he is thirsty.
"When Hairy Met Slimy" In a parody of
The Shape of Water, at the
Power Plant,
Selma enters a maximum-security door to sneak a cigarette. She finds herself in a laboratory, where she meets Kang and they fall in love. After offering to provide the secret to clean, natural energy,
Mr. Burns wants to dissect him, so they flee to a distant galaxy, with Homer's help. Selma and Homer sneak Kang out in a waste container full of rats, but Burns finds them. Kang bites off
Smithers' head and knocks out Burns, with Barney driving the trio out in his car. Burns and the military follow, but his driver is shot as they flee to Mt. Springfield. Once they escape, Kodos arrives with a spaceship, but a shooting takes place, and Selma is hit in the stomach. Kang then pulls out the
Infinity Gauntlet to eliminate all military people, and when Burns survives, he hits him with a tin can. Kang then heals Selma and tells her he is pregnant.
Patty arrives, protesting they are too different, being of different zodiac signs, but Kang points out he is from Sagittarius. Patty begs her not to go but falls in love with Kodos. The four of them fly to space, and find themselves on the honeymoon planet, in the cool season, where it is 4,000°F. The episode's title is a parody of the
romantic comedy film When Harry Met Sally.... The episode concludes with a collage of clips from previous Treehouse of Horror episodes. ==Reception==