After winning a motorcycle at a dance contest, Homer becomes part of a motorcycle gang. But when he puts Marge's photo in a biker magazine, a much tougher gang takes her, and he must win her back.

Springfield legalizes same-sex marriage to increase tourism. After becoming a minister, Homer starts to wed people to make money. Meanwhile, Marge's sister Patty comes out as a lesbian and reveals that she is going to marry a woman named Veronica.

Scotty Boom, a Chew Network super-chef, challenges Homer to a smoke-off. But when someone steals Homer’s secret weapon – a smoker he bought off a mysterious man at a BBQ shack – Lisa and Bart are on the case.

When Lisa becomes scared at the Krustyland Halloween Horror Night, Homer is forced to take down his Everscream Terrors decorations. Halloween pop-up employees seek vengeance on Homer for causing them to lose their jobs, and rob his house while Homer and Lisa hide out in the attic. Homer and Lisa light up their stored holiday decorations to attract attention and stand up to the intruders.

Lisa sets out to restore the tarnished reputation of Springfield’s first female inventor. To find her invention, she scours an abandoned asylum and a restaurant that caters to men. Bart joins Lisa at the asylum, stealing one of the homicidal patient’s notebooks, and bragging to the boys at school that he wrote the entries himself. This revelation causes Homer and Marge to believe he is a sociopath, which Bart decides to use to his advantage until things go too far.

After a photo Marge posts on social media gets Homer fired, he returns to the best job he ever had, a dishwasher at a Greek restaurant. This same post inspires Lisa to code an app that predicts the real-life consequences of anything you post online, only to create sentient artificial intelligence.

There is a new teacher at Springfield Elementary, and a captivated Bart tries everything to win her over. Meanwhile, Homer decides to buy a new brand of “milk,” which causes early puberty, both for Bart (augmenting his wooing powers) and Lisa (whose small bout with acne opens her up to the world of makeup and popularity).

The 666th episode of the Simpsons parodies the Omen and Stranger Things, not to mention a little Crazy Rich Aliens.

The Simpsons face various Thanksgiving nightmares, including the first Thanksgiving, an A.I. mishap and a dangerous space mission complicated by a sentient cranberry sauce.