Homer becomes a department store Santa, Bart cheats during an exam and finds himself hailed as a child genius, and a near-tragic accident gives Homer a new lease of life.
Mr Burns has Homer committed to a mental facility, Lisa wins a trip to Washington, and Ned Flanders opens a shop catering exclusively for left-handed customers.
Accusations fly thick and fast in the wake of Mr Burns's shooting, Bart and Milhouse vie for the role of Fallout Boy in a new film, and Homer and Marge are accused of being bad parents.
Lisa creates an alternative world in a margarine tub, Homer gets a new job at a better nuclear power plant, and Moe discovers Homer has a unique genetic condition that protects his brain from injury.
Homer takes his family on a trip to New York, Principal Skinner is exposed as an imposter, and Bart angrily breaks Lisa's treasured saxophone.
Homer tries to make money from selling used grease, Bart looks after a bird's nest filled with eggs, and Lisa tries to make amends for cheating in an exam.
Angry dolphins attack Springfield on Halloween, Homer stages a revolt against moves to give Springfield a new telephone dialling code, and Krusty learns he has a daughter.
Lisa and Bart embark on a Harry Potter-style adventure, a judge rules that Homer is a negligent father, and Moe turns his bar into a swanky establishment.
Homer dreams of stardom when the Rolling Stones need his help, Lisa is thrilled to learn she has been moved up a grade at school, and a mix-up results in Marge being given breast implants.
Bart and Milhouse play tricks with a mysterious watch, Homer tries to help his fugitive mother evade justice, and Lisa is elected student president.
Lisa becomes a Sherlock Holmes-style super-sleuth, Homer challenges Marge to a baking contest, and Lisa is teased by her classmates for having a weight problem.
Homer takes Fat Tony's place as head of the local Mafia, Bart becomes an acclaimed jazz drummer, and Marge starts a carpentry business.
Lisa's Malibu Stacy car turns into a robot determined to start a war, Homer becomes a bounty hunter, and Bart lands himself in trouble when he steals a mobile phone from actor Denis Leary.
Homer is cast as the lead in a superhero movie, a prank played by Bart leads to Mrs Krabappel being fired, and Marge campaigns against a violent sport.
Lisa embraces her creative side at a performing arts camp, Grampa gives each member of the family $50, and Lisa signs up to coach Bart's Little League baseball team.
Homer befriends a former CIA agent, Bart discovers a passion for American history, and Ned Flanders becomes a night-time vigilante.
Homer returns from a nuclear convention a changed man, locals address the biggest regrets of their lives so far, and Marge concocts a plan to make Homer feel more alive.
In Season 27, Homer and Marge have a trial separation, Sideshow Bob finally achieves his dream, Lisa is traumatised at Krustyland Horror Night, and Patti moves in with Homer and Marge.