In the film, the Joker tests how far Batman will go to save Gotham City from descending into chaos.
Based on the DC Comics supervillain of the same name, he is depicted as a psychopathic criminal mastermind with a warped, sadistic sense of humor who defines himself by his conflict with the vigilante Batman. The Joker is a character portrayed by Heath Ledger and the main antagonist in Christopher Nolan's 2008 superhero film The Dark Knight.
