About this "The Simpsons" episode:

The Simpsons - Dark Knight Court is the 16th episode of season 24 and number 524 overall in the series.

Springfield celebrates the Easter. During their celebration hundreds of eggs are suddenly fired at the townspeople, ruining their clothes and splattering the streets. The citizens immediately suspect Bart after seeing him laughing at their misfortune. Bart repeatedly denies committing the prank, and Lisa eventually decides that the best way to determine his guilt is to hold a trial, which is presided by Janet Reno. However, the odds do not look good in Bart's favor, and he is close to being found guilty. Meanwhile, Mr. Burns rediscovers his love of superheroes after visiting Comic Book Guy's store, and he decides to become a superhero named Fruitbat Man. However, Smithers, fearful of Burns's safety, stages numerous crimes for his boss to thwart, using Homer, Lenny, Carl, the Crazy Cat Lady, and other citizens as patsies for supervillain identities, but Burns soon finds out Smithers's schemes and becomes outraged.
Desperate to find someone to solve Bart's dilemma, Lisa tries to hire Burns, but he refuses. Through clues, Lisa deduces that Groundskeeper Willie was responsible as his kilt had only one egg splattered on it, compared to the other articles of clothing. She confronts him, and he confesses to committing the prank, citing his inbred hatred of Easter as his motivation. He then attempts to escape, but Burns intervenes, having had a change of heart. Willie is captured and turned in just before Bart can be found guilty of the accusations against him. Lisa thanks Burns and tells him that this could be a good opportunity for him to become a better person.