The Dark Knight,The Joker

The Joker is a fictional character who appears in Christopher Nolan's 2008superhero film The Dark Knight. Based upon the DC Comics character of the same name, he was played by Australian actor Heath Ledger. A psychopathic mass murderer with a sadistic sense of humor, the Joker's arc follows his attempt to undermine the efforts of Batman (Christian Bale), James Gordon(Gary Oldman), and Harvey Dent (Aaron Eckhart) to rid Gotham City of crime. The character embodies themes of chaos, anarchy and obsession: throughout the film, he expresses a desire to upset social order through crime, and defines himself by his conflict with Batman.