Zack Snyder’s Justice League is the 4-hour director’s cut released in 2021 on HBO Max, restoring Snyder’s original vision for the 2017 team-up film. It’s presented in 6 chapters + epilogue, with a 4:3 aspect ratio and an R rating. The story picks up after Batman v Superman: Dawn of Justice and fundamentally reshapes the tone, plot, and characters of the theatrical cut.
Months after Superman’s death, the world mourns and crime surges. Bruce Wayne/Batman is haunted by nightmares of a dark future where a corrupted Superman rules. To honor Clark and prepare for an invasion he believes is coming, Bruce sets out to unite metahumans. Meanwhile, ancient Mother Boxes — living machines left on Earth by Darkseid — awaken. One is guarded by the Amazons on Themyscira, one by the Atlanteans, and one was buried by humans. When Steppenwolf, Darkseid’s disgraced uncle, returns through a Boom Tube, he begins hunting the Boxes to reform the Unity and terraform Earth for his master.
Diana Prince/Wonder Woman works with Bruce to recruit the others. Arthur Curry/Aquaman initially refuses, blaming the surface world for Atlantis’s pain, but joins after Steppenwolf attacks Atlantis and takes its Mother Box. Victor Stone/Cyborg, resurrected by his father Silas using the third Box, is wracked with trauma over his new cybernetic body but holds the key to interfacing with alien tech. Barry Allen/The Flash, a young forensic science student, is eager to join and test his powers. The team struggles to function without Superman’s raw power, and after Steppenwolf takes all three Boxes, they decide their only option is to use the human Mother Box to resurrect Clark in the Kryptonian ship.
The resurrection succeeds but backfires: a disoriented, memory-shattered Superman attacks the League. Bruce’s contingency — Lois Lane — arrives and helps Clark regain himself, and he leaves with her to recover at the Kent farm. Without Superman, Steppenwolf unites the Boxes in Russia, starting the Unity that will destroy Earth and summon Darkseid. Silas Stone sacrifices himself to heat the last Box so the team can track it. The League assaults Steppenwolf’s fortress: Batman leads ground forces, Wonder Woman and Aquaman fight parademons, Flash enters the Speed Force to run back time after a failed charge, and Cyborg jacks into the Unity to separate the Boxes.
Superman returns in a black suit, joining the fight and overpowering Steppenwolf. With Flash’s time-reversal and Cyborg’s connection, the Unity is stopped. Aquaman impales Steppenwolf, Superman freezes him, and Wonder Woman decapitates him, sending his head through a Boom Tube to Darkseid’s feet. On Apokolips, Darkseid, DeSaad, and Granny Goodness learn Earth holds the Anti-Life Equation. Darkseid vows to take Earth “the old ways,” without the Mother Boxes. The League stands united, Bruce buys Wayne Manor to make it their Hall of Justice, and the epilogue teases Knightmare futures, Joker, Martian Manhunter, and Lex Luthor feeding secrets to Deathstroke, setting up sequels that never came.
The film reframes Cyborg as the “heart” of the story, gives Steppenwolf clearer motivation, restores Darkseid as the true threat, and leans into mythic, tragic tone with longer character arcs, expanded world-building, and Snyder’s stylized action.
