Justice League is a 2017 American superhero film based on the DC Comics superhero team of the same name. It is the fifth installment in the DC Extended Universe (DCEU) and a follow-up to Batman v Superman: Dawn of Justice, and was directed by Zack Snyder and written by Chris Terrio and Joss Whedon, based on a story by Terrio and Snyder. It features an ensemble cast that includes Ben Affleck, Henry Cavill, Amy Adams, Gal Gadot, Ezra Miller, Jason Momoa, Ray Fisher, Jeremy Irons, Diane Lane, Connie Nielsen, J. K. Simmons, and Ciarán Hinds. In the film, Batman and Wonder Woman recruit The Flash, Aquaman, and Cyborg after Superman’s death to save the world from the catastrophic threat of Steppenwolf and his army of Parademons.
Warner Bros. began to develop a live-action Justice League film in 2007. The studio tapped Michele and Kieran Mulroney to pen a screenplay which became known as Justice League: Mortal. George Miller signed on to direct later that year with casting taking place shortly after. Warner Bros. fast-tracked the film for a summer 2009 release but production was halted by the 2007-08 Writers Guild of America strike. The project was cancelled following production delays and budgetary concerns despite the principal roles having been already cast. A Justice League film would re-enter development as part of Warner Bros’ upcoming DC film slate in October 2014, with Snyder on board to direct and Terrio attached to write the script. The film was initially titled Justice League Part One, with a second film (under the name Justice League Part Two) intended to follow in 2019. However, the sequel was indefinitely delayed to accommodate the production of a standalone Batman film starring Affleck. Principal photography took place from April to October 2016. After Snyder stepped down from the film following the death of his daughter, Whedon was hired to oversee the remainder of post-production, including writing and directing additional scenes, which changed most of the film. With an estimated production budget of $300 million, Justice League is one of the most expensive films ever made.