>Darkseid invades Earth in ancient times, but is repeled by humanity, Atlantis and Themyscira, and three Mother Boxes are left behind and divided between the three. Once united they become a weapon of mass destruction.
>On present day, Darkseid's enforcer Steppenwolf is lured to Earth by Lex Luthor's experiments with Kryptonian technology and his soldiers, the Parademons, begin kidnapping scientists.
>Batman finds out about it and asks Wonder Woman for help to recruit a team to stop them. The Flash agrees, Aquaman and Cyborg initially decline. Cyborg later changes his mind when his father is kidnapped.
>Batman, Wonder Woman, Flash and Cyborg find the Parademons' nest in an underground tunnel at Stryker's Island and rescue the scientists, while Steppenwolf steals Atlantis' Mother Box, forcing Aquaman to join the team.
>The heroes attempt to protect Themyscira's Mother Box, but fail and believe joining forces was a mistake. Batman convinces them they can't give up and they converge to protect the last Mother Box which is in possession of the United States.
>Batman interrogates Luthor about Steppenwolf and ends up fighting Deathstroke, who has been hired to rescue Luthor.
>Steppenwolf ultimately retrieves the last Mother Box and activates the weapon in order to subjugate Earth.
>The heroes find a way to revive Superman and he returns to help them defeat Steppenwolf. Cyborg interfaces with the weapon, disables it, and teleports the Parademons back to Apokolips.
>The world saved, the heroes decide to stay together as the Justice League. Luthor assigns Deathstroke to kill Batman in revenge for Batman sending him to Arkham Asylum. Darkseid finds out about the Justice League and decides to attack Earth himself.
