The Dark Knight starred Ledger as the Joker.
The Dark Knight (film) . Featuring the DC Comics character Batman , the film is the second part of Nolan 's The Dark Knight Trilogy and a sequel to 2005 's Batman Begins , starring an ensemble cast including Christian Bale , Michael Caine , Heath Ledger , Gary Oldman , Aaron Eckhart , Maggie Gyllenhaal and Morgan Freeman . In the film , Bruce Wayne/Batman ( Bale ) , James Gordon ( Oldman ) and Harvey Dent ( Eckhart ) form an alliance to dismantle organized crime in Gotham City , but are menaced by a criminal mastermind known as the Joker ( Ledger ) who seeks to undermine Batman 's influence and create chaos . Warner Bros. initially created a viral marketing campaign for The Dark Knight , developing promotional websites and trailers highlighting screenshots of Ledger as the Joker .