Zack Snyder's Justice League, often referred to as the "Snyder Cut", is the 2021 director's cut of the 2017 American superhero film Justice League. It presents Justice League—the fifth film of the DC Extended Universe (DCEU), the sequel to Batman v Superman: Dawn of Justice (2016), based on the DC Comics team Justice League—as director Zack Snyder intended it before he left the production. Like the theatrical release, Zack Snyder's Justice League follows the Justice League—Batman (Ben Affleck), Superman (Henry Cavill), Wonder Woman (Gal Gadot), Cyborg (Ray Fisher), Aquaman (Jason Momoa), and the Flash (Ezra Miller)—as they attempt to save the world from the catastrophic threat of Darkseid (Ray Porter), Steppenwolf (Ciarán Hinds), and their army of Parademons.Justice League, released by Warner Bros. in 2017, suffered a difficult production. Its script underwent major changes before and during production between 2016 and 2017. In May 2017, Snyder stepped down during post-production following the death of his daughter, and Joss Whedon was hired to finish the film, completing it as an uncredited director. Whedon oversaw reshoots and other changes that incorporated a brighter tone and more humor, and cut the runtime down significantly in accordance with a mandate from Warner Bros. The theatrical version of Justice League received mixed reviews and was a box-office bomb, leading Warner Bros. to reevaluate the DCEU's future, and to focus on developing films around individual characters.As details surfaced about the film's troubled production and its state before Snyder stepped down, many fans expressed interest in an alternate cut more faithful to Snyder's vision. Fans and members of the cast and crew petitioned for the release of this, which they nicknamed the Snyder Cut. Industry insiders considered the release unlikely. However, Warner Bros. decided to move ahead with it in February 2020; and in May, Snyder announced that the original cut would be released as Zack Snyder's Justice League via the streaming service HBO Max. It cost around $70 million to complete the visual effects, score, and editing, with new material filmed in October 2020. The release was originally planned as both a six-episode miniseries and a four-hour film, but the miniseries concept was scrapped by January 2021. The film is dedicated to the memory of Snyder's daughter, Autumn.Zack Snyder's Justice League was released on HBO Max in the United States on March 18, 2021. Critics generally considered it an improvement over the 2017 theatrical version, with praise for Snyder's direction and deeper characterizations, but some considered its four-hour runtime excessive.