Homer embraces the "old person lifestyle" when Grampa and two other octogenarians move into the Simpson home, while Nelson becomes friends with Bart, who defends Nelson's love for hand-me-down underwear.
Homer takes a dangerous dive into an isolated canyon on Candy Peak, but when a crashing boulder traps his arm, he channels Aron Ralston to save himself. In "The Diving Bell and Butterball," the first of three hair-raising Halloween tales, a venomous spider bite leaves Homer paralyzed, but when Lisa discovers Homer's ability to communicate through natural gases, he is able to express his love for Marge. The killer spells continue in "Dial D for Diddly," when Ned Flanders, devout preacher by day, transforms into a cold-blooded vigilante by night. In the final terrifying...
Krusty the Clown is stuck in a rut when the television network pulls his show from the air and his talent agency drops him as a client. But when the Simpsons introduce him to seasoned agent Annie, they are surprised to learn that Annie was Krusty's very first agent. Despite their rocky relationship, Annie is convinced to re-sign Krusty and craft his career comeback. But when Krusty's retro comedy show reboot is deemed a critical success, Krusty must decide to stay with his agent or side with the network executives.
It's the most wonderful time of the year, and the Simpsons flash forward thirty years and find themselves in a tech-savvy, futuristic Springfield. Bart and Lisa have children of their own and decide to spend the holidays as one big family at Homer and Marge's house. Lisa and Bart turn to Homer and Marge for parenting advice and begin to realize that the apple doesn't fall far from the tree.