“Chief of Hearts” is the eighteenth episode of Season 21, which aired on April 18, 2010. The episode was written by Carolyn Omine and William Wright and was directed by Chris Clements. The episode features guest appearances by Jane Kaczmarek as Judge Constance Harm, Maurice LaMarche and Joe Mantegna as Fat Tony.
Homer and Chief Wiggum become close friends during Homer’s community service stint, but when Homer leaves Wiggum’s side during his recuperation to go to Moe’s, the Chief takes offense; Bart becomes addicted to “Battle Ball”, a Japanese game with cards and plastic balls that turn into creatures.