The story opens with a funeral for a fallen hero, attended by all the League members except Batman, who is shown spying on them with Brother Eye. The plot then flashes back to reveal that Batman created Brother Eye, a program designed to track and potentially neutralize metahumans.
Batman's fear that metahumans could turn evil and take over the world drives his actions and the creation of Brother Eye.
JLA: Tower of Babel" and "Superman: Sacrifice," would have seen the Justice League face off against Maxwell Lord, who controls Superman and unleashes an army of OMACs. The Flash sacrifices himself to stop Lord and destroy the OMACs, and the film concludes with the League preparing to face a new threat from space.
Maxwell Lord, using his psychic abilities, manipulates Superman and unleashes a wave of OMAC (robot) drones on the world.
The OMACs attack, forcing the League to protect civilians.
Maxwell Lord reveals he has a doomsday device implanted in himself, threatening the League with destruction if they try to kill him.
The Flash, realizing there's no other way to stop Lord, uses his speed to merge with the Speed Force, taking Maxwell Lord with him and sacrificing himself.
The Justice League, shaken but united, observes a new threat descending from space, hinting at a future battle against Starro.
