Zack Snyder's Justice League, commonly referred to as the "Snyder Cut", is the upcoming director's cut of the 2017 American superhero film, Justice League. It presents Justice League—the fifth film of the DC Extended Universe (DCEU) and based on the DC Comics superhero team of the same name—as director Zack Snyder had intended it before he left the production and Joss Whedon took over his duties. Like the theatrical release, Zack Snyder's Justice League follows the Justice League—Batman, Superman, Wonder Woman, the Flash, Aquaman, and Cyborg—as they attempt to save the world from the catastrophic threat of Steppenwolf and his army of Parademons.
The theatrical 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 Whedon took over, completing the film as an uncredited director. Whedon oversaw reshoots and other changes that added a brighter tone and more humor, and cut the runtime down to 120 minutes in accordance with a mandate from Warner Bros. The theatrical Justice League was a box-office disappointment and received mixed reviews, leading Warner Bros. to re-evaluate the future of the DCEU and focus development on individual films.
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. At the time, industry insiders regarded the release as unlikely. However, Warner Bros. decided to move ahead with it in February 2020; the following May, Snyder announced that the original cut would be released as Zack Snyder's Justice League via the streaming service HBO Max. The restoration will cost $20–30+ million to complete the visual effects, score, and editing.
Zack Snyder's Justice League is scheduled to be released in 2021 on HBO Max.