The Dark Knight is a 2008 American superhero film co-written and directed 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. The plot of the film focuses on Batman's fight against a new villain, the Joker (Heath Ledger) and his relationships with district attorney Harvey Dent (Aaron Eckhart) and his old friend and love interest assistant D.A. Rachel Dawes (Maggie Gyllenhaal).