Season 31 Episode 4
Original airdate: October 20, 2019
- Driven to Suicide: Jimbo, Shauna, and Kearney hang themselves because of Maggie.
- Exorcist Head: Maggie makes her stuffed animals' heads twist around.
- Sdrawkcab Name: Homer puts a Nemo poster in Maggie's room. When he looks in the mirror, he sees the character's name spelled as "Omen". He replaces it with a poster for Racecar, and when he sees it in the mirror, he shouts "Aah, palindrome!"
- Impaled with Extreme Prejudice: Demon!Maggie uses her powers to tear apart the church, causing falling spires to impale Ned, Homer and Marge, spelling out the "X X X" in this year's TOH.
- Ironic Death: Strangled by his own stethoscope, stuffed into a baby incubator and flash-fried...not Dr. Hibbert's best day at the office.
- Irony: Ned said he was going to have to dig three graves, implying it would be Maggie and his slacker-transformed sons, only for him, Homer and Marge to end up dead after Demon!Maggie goes on a rampage.
- Number of the Beast: Ned shows the Simpsons the "Mark of the Beast" on Maggie's head — a Mickey Mouse-shaped birthmark. He then realizes he was showing them the wrong mark, and shows them a 666 on her head. At the end of the sequence, the full mark is revealed to read "Episode 666 (or 667 if Fox rescheduled)". Doubles as Biting-the-Hand Humor.
- Red Eyes, Take Warning: Maggie's eyes glow red when showing her demonic nature.
- Wanted A Son Instead: Inverted Trope. Marge gives birth to a boy, much to Homer's disappointment since he fears him growing into another Bart. This prompts him to exchange the baby for Maggie, despite Dr. Hibbert warning him "she tested positive for evil". After Maggie kills Dr. Hibbert, Homer responds with, "Still better than a boy."
- Whole Plot Reference: To The Omen (1976).
- Chalk Outline: After Milhouse is abducted, the police make outlines of his inhaler and the massive pee stream he left behind.
- Meet Your Early Installment Weirdness: The "Over-Under" has the early The Tracey Ullman Show versions of Bart and Lisa.
- Mythology Gag: The arcade machine Bart plays is called Space Mutants.
- Reference Overdosed: To The '80s — everything from the E.T. the Extra-Terrestrial Atari game to New Coke.
- Whole Plot Reference: To Stranger Things.
Heaven Swipes Right
- Death of a Child: After Homer takes over Moe's body, it turns out that Moe is now in Maggie's body, which only means that Maggie died at some point so Moe can live in her body.
- Disney Owns This Trope: Heaven was bought out by Google.
- The Cameo: One of the prospective bodies Homer looks at is Professor Farnsworth.
- Formerly Fit: Homer is reincarnated in the body of a football player, which Marge is excited about. Unfortunately, the following morning, Homer has eaten so much the body is now as fat as the original Homer; to top it off, he instantly loses his hair, leaving him as bald as original Homer as well.
- Whole Plot Reference: To Heaven Can Wait (1978).
When Hairy Met Slimy
- Bizarre Alien Sexes: Kodos hooks up with lesbian Patty, claiming that they have thirty sexual identities.
- Grievous Harm with a Body: When he's caught escaping, Kang bites off Smithers' head and spits it at Burns, dazing him enough for Kang, Selma and Homer to get away.
- Interspecies Romance: Between Selma Bouvier and Kang.
- No-Sell: Zig-zagged. Burns seemingly survives a finger snap from Kang's Infinity Gauntlet knock-off, only to be knocked out/killed by a thrown can.
- Offscreen Teleportation: Selma calls Homer to help her free Kang with the prospect of her moving to another galaxy. Homer immediately appears next to her.
- Pop-Culture Pun Episode Title: The title is a pun on When Harry Met Sally....
- Whole Plot Reference: To The Shape of Water.