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Story

The Justice League, with Cyborg's assistance, stop the Royal Flush Gang's attempted robbery of a diamond vault using complex technology that allows them to pass through solid objects. Vandal Savage plots to start a new civilization by exterminating part of the population; he gave the technology to the Gang for testing. Savage hires Mirror Master to hack into the Batcomputer and steal contingency plans devised by Batman to incapacitate his League teammates, in case they go rogue. Savage assembles Cheetah, Star Sapphire, Bane, Metallo, Mirror Master and Ma'alefa'ak, who all have personal vendettas against the heroes, and pays them to simultaneously attack using the plans, altered to be lethal. When the supervillains agree, he welcomes them to the Legion of Doom.

Batman, as Bruce Wayne, is informed by Alfred Pennyworth that the bodies of Thomas and Martha Wayne have been exhumed and are missing. At their graves, Bruce is ambushed by Bane, who renders Bruce unconscious. Bruce is buried alive in his father's coffin and left a tape recorder with Bane's message to taunt him, which motivates him to break out. He realizes the League has been attacked using his contingency plans, which were constructed from studying physical and psychological weaknesses. Batman sets out to save the League, whilst Cyborg hears of the trouble and starts out on his own.

However, Cyborg is attacked by Cheetah with a scratch that sends nanomachines into his brainstem. The nanomachines cause him to see what Cheetah wants him to see, an assortment of super-villains. As his instincts prevent him giving up, Cyborg will fight until he dies from overexertion. Wonder Woman arrives on the scene, having escaped her contingency plan, examines Cyborg with her X-ray vision, and adjusts his sonic emitter to a frequency that neutralizes the nanites.

Martian Manhunter (as John Jones) celebrates his birthday with his colleagues. He receives a drink from Ma'alefa'ak in disguise, which is laced with magnesium carbonate; being disruptive to Martian biology, the Manhunter struggles to maintain form while expelling the magnesium. He is then set on fire, with the magnesium fuelling the flames continually. Batman provides aluminum oxide to neutralize the magnesium.

Flash is lured into Mirror Master's trap, resulting in a bomb being attached to his wrist. If he does nothing, tries to remove it or decreases in speed, the bomb will explode, killing everyone in a three-mile radius. Batman instructs him to run and vibrate through an iceberg in the Arctic, which leaves the bomb inside.

Lured to a mine, Green Lantern is targeted by Star Sapphire using Scarecrow's will-undermining fear gas; after failing to save her hostages' lives, she exploits his fears, convincing him that he doesn't deserve the power. Jordan renounces his ring and resigns to his fate in the collapsing mine. Batman shows him the hostages were just androids. Jordan reestablishes his willpower, removing the effects, and regains control of his ring.

On the Daily Planet's roof, a former employee named Henry Ackerman is aiming to commit suicide which is noticed by Lois Lane and Jimmy Olsen. After leaving the press conference of the Mayor of Metropolis as Clark Kent, Superman believes he has talked him out of it. However, Ackerman is actually Metallo in disguise and he shoots Superman with a Kryptonite bullet. It is extracted by Cyborg (using an improvised Kryptonite scalpel laser) and by Martian Manhunter, allowing Superman to recover.

The Justice League retreats to the Watchtower, where Batman reveals he was the real mastermind behind the plans. He also had one in place should the Batcomputer be hacked: a hidden tracing algorithm. The League track down the Legion of Doom and subdue them, but fail to prevent an apocalyptic cataclysm via solar flare. Using the Hall of Doom's technology, the League saves the Earth by phasing it so the flare harmlessly passes through.

At the Justice League Watchtower, it is mentioned that Vandal Savage was found guilty for crimes against humanity and is sentenced to life without parole. The Justice League adds Cyborg to their roster, and Superman calls for a vote on Batman's membership. Batman defends his plans, which originally were meant to only incapacitate, and criticizes the others for not understanding the potential danger of a rogue Justice League before quitting the team. When Superman asks if Batman had a plan to stop himself if he were to go rogue, Batman replies that the Justice League itself is his plan. With his trust in Batman assured, Superman hands him the Kryptonite bullet and teleports him out of the Watchtower.