The Batman franchise, based on the fictional superhero Batman who appears in American comic books published by DC Comics, has seen the release of various films. Created by Bob Kane and Bill Finger, the character first starred in two serial films in the 1940s, Batman and Batman and Robin. The character also appeared in the 1966 film Batman, which was a feature film adaptation of the 1960s television series starring Adam West and Burt Ward, who also starred in the film. Toward the end of the 1980s, the Warner Bros. studio began producing a series of feature films starring Batman, beginning with 1989's Batman, directed by Tim Burton and starring Michael Keaton. Burton and Keaton returned for the 1992 sequel Batman Returns, and in 1995, Joel Schumacher directed Batman Forever, with Val Kilmer as Batman. Schumacher also directed the 1997 sequel Batman & Robin, which starred George Clooney. Batman & Robin was poorly received by both critics and fans, leading to the cancellation of a sequel titled Batman Unchained.
Following the cancellation of two further film proposals, the franchise was rebooted in 2005 with Batman Begins, directed by Christopher Nolan and starring Christian Bale. Nolan returned to direct two further installments through the release of The Dark Knight in 2008 and The Dark Knight Rises in 2012, with Bale reprising his role in both films. Both sequels earned over $1 billion worldwide, making Batman the second film franchise to have two of its films earn more than $1 billion worldwide. Referred to as "the Dark Knight trilogy", the critical acclaim and commercial success of Nolan's films have been credited with restoring widespread popularity to the superhero, with the second installment considered one of the best superhero films of all time.