Zack Snyder's Justice League (2021) Timeline Explained – Every Event in Order

Batman (Bruce Wayne) decided to recruit other superheroes because he believed Earth needed protection after Superman's death. Having witnessed the alien threat from Steppenwolf and his Parademons, as well as learning about Darkseid's history with the Mother Boxes, Bruce realized that no single hero could stop this global threat alone. He knew he needed to assemble Aquaman, Wonder Woman, Cyborg, and The Flash to have any chance of defending humanity.

Foreshadowing: Earlier scenes show Bruce warning Alfred that the world is changing and that they need to prepare for threats beyond their current capabilities.

• batman
• recruit
• justice league
• superman death
• threat
• steppenwolf

Arthur Curry (Aquaman) initially refused Bruce Wayne's recruitment because he wanted nothing to do with humans or their conflicts. After being raised believing he was abandoned by both worlds, Arthur preferred to stay in the ocean and live among the seas rather than involve himself in surface world problems. He told Bruce he had no interest in being a hero or leader, rejecting the responsibility that came with his heritage.

Foreshadowing: Arthur's reluctance is established through his solitary lifestyle in Iceland and his refusal to embrace his Atlantean royalty.

• aquaman
• arthur curry
• recruitment
• refusal
• bruce wayne

Steppenwolf arrived on Themyscira through a portal and attacked the Amazons who guarded the Mother Box. Despite Queen Hippolyta and her warriors fighting bravely, Steppenwolf's Parademon army overwhelmed them. Hippolyta was forced to flee with the Box while her sisters sacrificed themselves to buy her time. Steppenwolf pursued and ultimately claimed the Mother Box, taunting Hippolyta before departing.

Foreshadowing: Earlier, the Amazons noticed their Mother Box cracking, suggesting it was reacting to external forces and signaling the approaching danger.

• steppenwolf
• mother box
• themyscira
• amazons
• hippolyta
• steal

The Justice League resurrected Superman because they believed he was Earth's only hope against Steppenwolf's invasion. With the threat of the Unity, a process that would merge Steppenwolf's forces with Earth using all three Mother Boxes, the team decided they needed Superman's immense power. They exhumed his body from the cemetery and used the Mother Box's energy combined with The Flash's speed to revive him.

Foreshadowing: The plan to revive Superman was hinted at when Diana and Bruce discussed the Mother Boxes' regenerative capabilities and their connection to Kryptonian biology.

• superman
• resurrection
• justice league
• revive
• mother box
• flash

Superman's violent outburst after resurrection occurred because he was disoriented and overwhelmed by his senses. Having been dead and then suddenly brought back, he woke in a state of confusion, seeing the League as threats rather than allies. His heightened Kryptonian senses detected the foreign DNA in Cyborg (created by the Mother Box), causing him to perceive the heroes as enemies. Lois Lane's calming presence was needed to snap him out of this confused state.

Foreshadowing: The team discussed the risks of resurrection, acknowledging that Superman might not return as himself.

• superman
• confusion
• attack
• lois lane
• resurrection
• cyborg

The Unity is a catastrophic process that would merge Steppenwolf's army with Earth itself using the combined power of all three Mother Boxes. When activated, the Unity creates a resonance that transforms the planet into a hellish landscape similar to Apokolips, Darkseid's homeworld. This would essentially destroy humanity and give Darkseid a new conquered world to add to his empire.

Foreshadowing: Diana's research at the temple revealed ancient drawings depicting the Unity's devastating effects and Darkseid's previous failed attempt to use the Boxes.

• unity
• mother boxes
• apokolips
• darkseid
• steppenwolf
• invasion

Silas Stone, Victor Stone's father, sacrificed himself to prevent Steppenwolf from obtaining the final Mother Box. When Steppenwolf attacked the laboratory where the Box was hidden, Silas realized he couldn't stop the villain alone. He activated the lab's self-destruct mechanism, destroying the facility and himself along with it, but ensuring Steppenwolf couldn't take the Box. This act showed Victor the true meaning of sacrifice and family.

Foreshadowing: Earlier scenes established Silas's guilt over experimenting on Victor with the Mother Box, making his ultimate sacrifice an act of redemption.

• silas stone
• sacrifice
• cyborg
• father
• death
• mother box

The Flash saved the day by running so fast that he reversed time itself. As Steppenwolf was about to complete the Unity and merge Earth with Apokolips, Barry Allen (The Flash) tapped into the Speed Force and ran in the opposite direction, causing time to flow backward. This undone the Unity process, separated the Mother Boxes, and gave the League the opportunity to defeat Steppenwolf permanently.

Foreshadowing: Barry's ability to manipulate time was hinted at when he accidentally saved Iris West by moving faster than the speed of light.

• flash
• barry allen
• speed force
• reverse time
• unity
• save world

Queen Hippolyta chose to flee with the Mother Box rather than continue fighting because staying would have meant certain death and the Box would have been lost anyway. By escaping, she could protect the Box and alert Diana (Wonder Woman) to the threat through the sacred fire. Her sisters sacrificed themselves to cover her escape, making it a strategic decision rather than cowardice, preserving the Box was more important than any single battle.

Foreshadowing: The cracking of the Amazon Mother Box earlier signaled that danger was imminent and required immediate action.

• hippolyta
• themyscira
• escape
• mother box
• amazons
• queen

Cyborg (Victor Stone) initially refused to join because he was struggling with his new identity and resented his father's role in his transformation. He only agreed after witnessing Silas's sacrifice and understanding that his father's actions, though flawed, came from love. Victor realized that his powers could be used for good and that shutting himself off from the world wouldn't honor his father's memory. He also saw the League as his new family.

Foreshadowing: Victor's arc shows him gradually accepting his humanity despite his cybernetic enhancements, culminating in his choice to fight alongside the League.

• cyborg
• victor stone
• join team
• sacrifice
• father
• redemption

Darkseid wants to conquer Earth and transform it into a new Apokolips using the Anti-Life Equation. The Mother Boxes are ancient devices that, when united, can facilitate this transformation. Steppenwolf is working as Darkseid's servant to collect all three Boxes and perform the Unity. A flashforward in the film shows Darkseid's brutal reign over an alternate future, demonstrating exactly what he intends to do to Earth.

Foreshadowing: Ancient paintings in Themyscira and Diana's research reveal Darkseid's previous attempt to conquer Earth thousands of years ago.

• darkseid
• anti-life equation
• earth
• conquest
• apokolips
• invasion

In the post-credits scene, Lex Luthor (escaping prison) meets Deathstroke and reveals he has learned the secret identity of Batman. Luthor tells Deathstroke that he has assembled a league of his own, hinting at the formation of the Legion of Doom. Their conversation suggests they plan to target Batman specifically, setting up future conflicts between the heroes and villains.

Foreshadowing: Lex Luthor's established hatred of Superman and his megalomaniacal tendencies foreshadow his role as a mastermind against the Justice League.

• lex luthor
• deathstroke
• post credits
• legion of doom
• batman
• scheme