Batman: The Animated Series S03E07 - Make 'Em Laugh

Using microchips stolen from the Mad Hatter, the Joker brainwashes famous comedians into committing crazy crimes in order to ruin their reputations. As it turns out, the comedians are the judges who tossed the Joker out of the Gotham Comedy Competition the year before. Now, the Clown Prince of Crime wants to seek his revenge, and Batman and Robin must foil the Joker's plot.