The Dark Knight is a 2008 superhero film directed, produced and co-written by Christopher Nolan. Based on the DC Comics character Batman, the film is part of Nolan's Batman film series and a sequel to 2005's Batman Begins. Christian Bale reprises the lead role of Bruce Wayne/Batman, with Michael Caine, Gary Oldman and Morgan Freeman returning as Alfred Pennyworth, James Gordon and Lucius Fox, respectively. The film introduces the character of Harvey Dent (Aaron Eckhart), Gotham's newly elected District Attorney and the cohort of Bruce Wayne's childhood friend Rachel Dawes (Maggie Gyllenhaal), who joins Batman and the police in combating the new rising threat of a criminal calling himself the "Joker" (Heath Ledger).