Homer is hypnotized into believing he's ten years old and ends up stuck in his new age when the hypnotist dies, so he bonds with Bart and refuses to take back the responsibilities of adulthood.
Inventor Elon Musk comes to Springfield, and Homer inspires him with a new idea that could revolutionize Springfield, but winds up costing Mr. Burns a ton of money.
Marge gets a job as a driver for a transportation app service, while Moe is forced to work as a janitor at the nuclear plant after Homer causes the bar to go bankrupt.
The congregation, led by Marge, is forced to resort to gambling in order to collect money to fix the church, which Chief Wiggum destroyed with a jet pack he received by mistake.
After "Duffman" retires, Homer wins a reality competition to become his replacement. But his contract states that he cannot drink beer, which gives him a new perspective on alcohol.
Marge decides to follow Bart everywhere until he confesses to being involved in a bulldozer crash. Meanwhile, Homer ignores Santa's Little Helper when Ned gets a new dog.
Marge decides it's finally time to separate from Homer, and quickly moves on with her life. Homer is initially devastated, but soon stumbles into a romance with a younger woman.
Patty and Selma try to quit smoking, but Patty moves in with the Simpsons when Selma takes it up again. Meanwhile, Maggie goes on an adventure with some local creatures.
The Simpsons are proud to be the most festively decorated house on the block. But when Lisa is traumatized at Krustyland Horror Night, she feels she cannot handle Halloween anymore.
After killing Bart, Sideshow Bob doesn't know what to do with himself; Homer wakes up with short-term memory loss; Because of radiation, Lisa, Bart and Milhouse gain super-powers.
Lisa makes a new friend at school - Harper, who happens to be super-rich, while Homer makes friends with Harper's dad and sets out to continue living the good life when Lisa decides to end the friendship.
Lisa tries to restore the reputation of a forgotten Springfield female inventor, while Bart takes full advantage of a diagnosis that he is a sociopath.
A tale of Bart's journey from youth to adulthood, where he is constantly in search of approval from his father and in the shadow of his more-successful younger sister.