
Once Upon a Time in Springfield
Krusty grudgingly adds a pretty, singing cohost named Princess Penelope to his show in order to attract more female viewers. Girls love her, and ratings improve, but Bart and Milhouse want to get the show back to the way it was. The situation gets more complicated when Krusty and Penelope fall in love and decide to get married. Meanwhile, Homer, Lenny, and Carl consider working at a competing nuclear plant when Mr. Burns cuts off their daily doughnut service.
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More from this season

S21 E1
Homer the Whopper
Homer gets the lead in a movie about a superhero who can take on the powers of every superhero in any comic book he touches. To whip Homer into superhero shape, the studio hires a celebrity fitness trainer.

S21 E2
Bart Gets a 'Z'
The fourth grade students of Springfield Elementary School decide to spike Ms. Krabappel's coffee in order to teach her a lesson after she takes away their cell phones. She is fired by Principal Skinner, who hires a new teacher named Zachary Vaughn. Although Vaughn is a hip young teacher who impresses the students, Bart is plagued by guilt and tries to get Ms. Krabappel hired back.

S21 E3
The Great Wife Hope
The men and boys in Springfield become obsessed with Ultimate Punch Kick and Choke Championships, a violent sport where fighters inflict severe pain on each other. When Marge and her friends stage a protest against the sport, the show's promoter embraces the controversy and challenges Marge to a match, promising to shut down the competition if she wins. She begins to train with rhythmic gymnastics, but her family step in and get her professional martial arts help to give her a real chance at winning.

S21 E4
Treehouse of Horror XX
Dial "M" for Murder or Press "#" to Return to Main Menu- Lisa is forced into a Hitchcockian murder scheme by Bart. Don't Have a Cow, Mankind- Springfield is once again overrun by zombies, thanks to Krusty Burger's latest sandwich. There's No Business Like Moe Business- In a Sweeney Todd spoof, Moe bleeds Homer dry to create the perfect microbrewed great beer.