You never want to be in debt to the Joker. The series had its share of great Joker episodes, but for my money Joker's Favor is the cream of the crop. For one thing, this episode introduced Harley Quinn, not only to animation, but this was her very first appearance anywhere. She would later be adapted to the comics, but her origins were here. So along with that historic bit of trivia, Joker's Favor really captured the Joker's sadistic nature in a way that made him a terrifying not only to Batman but to average Joe's like you and me. All it takes is one bad day...
