When a video goes viral of Bart and Homer fighting goes viral, they begin a journey as social media celebrities. Meanwhile, Lisa battles the school's new industrialized detention system.
Homer is demoted to supervising interns, among whom is go-getter millennial Mike, a 35-year-old who asks Homer to be his mentor. However, when Homer inspires Mike to start a business of his own, the two find themselves being chased by the mob.
When the wrong man is arrested for pickpocketing Springfield during the San Castellaneta street festival, Chief Wiggum sets out to catch the real criminal.
Horrors include a demon Maggie, a mission to rescue Milhouse from another dimension, dead-Homer's spirit trying on some new bodies for size, and Selma finally finding love in an unlikely place.
After a trip to Aquatraz Water Park, Lisa becomes determined to set free Springfield's most vicious animals in captivity. Meanwhile, Homer fulfills a lifelong dream of buying a boat, and quickly realizes boat ownership sucks.
Marge becomes a competitive lumberjack and goes on a month-long retreat to Portland with her trainer, whom Homer fears will take his wife away from him.
The Simpsons join other Springfield families on the Van Houten's annual trip to Costa Rica, which they obviously can't afford. While there, Homer befriends Patty's new girlfriend, Evelyn, and Lisa tracks down the real reason the Van Houtens can go on this trip every year.
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.
Todd blames God for the death of his mother and rejects his faith, so Ned sends him to live with the Simpsons, hoping they can scare him into believing in God again.