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  The Justice League, with Cyborg's assistance, stop the Royal Flush Gang's attempted robery of a diamond vault using complex technology that allows them to pass through solid objects. Meanwhile, Vandal Savage plots to exterminate the greater part of the human population and start a new civilization; he discreetly gave the technology to the Gang for testing purposes. To ensure the Justice League cannot stop him, 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 Mirror Master, Bane, Cheetah, Ma'alefa'ak, Star Sapphire, and Metallo, who all have personal vendettas against the heroes and pays them to simultaneously attack using the stolen plans, albeit altered to be lethal. When the supervillains agree, he welcomes them to the Legion of Doom.
  The villains each do their part to take out each member of the Justice League:
  
  Batman, as Bruce Wayne, is informed by Alfred Pennyworth that the bodies of Thomas and Martha Wayne have been exhumed and are missing. At his parents' graves, Bruce is ambushed by Bane, who gains the upper hand and renders Bruce unconscious. Bruce is buried alive in his father's coffin; he is left a tape recorder with a message from Bane taunting him, which motivates him to break out of the coffin. He realizes that the League has been attacked using his contingency plans, which were constructed from studying physical and psychological weaknesses in the event the League went to the other side or succumbed to mind control. With Cyborg's help, he saves his teammates one by one.
  Wonder Woman is attacked by Cheetah with a scratch that sends nanomachines into her bloodstream. The nanomachines attach to the brain stem and cause her to believe everyone she sees is a duplicate of Cheetah. Since she would never surrender, it is likely Wonder Woman would force herself to fight until her body gives out. Cyborg adjusts his sonic emitter to a frequency that neutralizes the nanites.
  Martian Manhunter (as John Jones) celebrates his birthday with his colleagues from the police force. He receives a soda from a mysterious woman (Ma'alefa'ak in disguise). The drink is laced with magnesium carbonate, which is disruptive to Martian biology, leaving the Manhunter struggling to maintain his form while sweating out the highly flammable magnesium. Ma'alefa'ak uses a lighter to set him on fire, leaving him to constantly burn, even when he goes into the nearby ocean. Batman provides aluminum oxide that when injected neutralizes the magnesium.
  The Flash is lured into a trap by Mirror Master, which results in a bomb attached to his wrist. The bomb will explode and kill everyone in a three mile radius if he does nothing or tries to remove it. The only way to prevent this is to run and never decelerate. Batman instructs him to run and vibrate through an entire iceberg in the ArcticâFlash just barely manages to escape the blast radius.
  Green Lantern is called by the FBI to deal with a hostage situation at a salt mine. Both the terrorists and hostages are actually sophisticated androids. Previously being exposed to a version of Scarecrow's fear gas that undermines his will, Green Lantern is fooled into thinking his overconfidence caused innocent lives being lost. Star Sapphire shows up to exploit his fears, convincing him that he does not deserve the power. Green Lantern renounces his ring, without which he cannot escape the collapsing mine, and resigns his fate. Batman shows him the hostage in his arms was an android when he takes off its head and offers him an antidote to the gas. Jordan rejects it and reestablishes his willpower, instantly removing the fear gas effect. He summons his ring to become Green Lantern again.
  Superman, as Clark Kent, is lured to the roof of the Daily Planet by a former employee, Henry Ackerdson, who aims to commit suicide. Superman appears to have succeeded in talking him out of it, when he is shot with a Kryptonite bullet by Ackerdson (Metallo in disguise). Superman's physiology makes it impossible to extract the bullet through conventional means. It is surgically extracted by Cyborg, using a Kryptonite scalpel laser, and Manhunter, who shapeshifts his fingers and pulls the bullet out; Superman regains consciousness.
  The Justice League retreats to the Watchtower, where Batman reveals that he was the real mastermind behind the contingency plans; he also had a plan should the Batcomputer be hacked: a tracing algorithm hidden in his files. The League are able to track the Legion of Doom. The villains are subdued, but they fail to prevent an apocalyptic cataclysm via solar flare. Batman devises a plan to use the Hall of Doom's technology to phase the Earth so the flare can go through itâthe League barely manages to save the Earth.
  In the aftermath of their victory, the Justice League adds Cyborg to their roster; Superman calls for a vote on Batman's continued membership in the team. Batman defends his plans, expressing no regrets for his actions. He criticizes them for not understanding the potential danger of a rogue Justice League and quits the team before they begin voting. As Batman prepared to leave, Superman questions the nature of his contingency plans. Batman explains that the original plans were meant to immobilize, Savage altered them to be lethal, and that exhuming the bodies of Thomas and Martha Wayne and then burying Bruce was entirely Savage's idea. When Superman asks Batman if he is still arrogant enough to not create a contingency plan to stop himself, Batman replies there is one: the Justice League. With his own trust in Batman assured, Superman hands him the Kryptonite bullet for Batman to use if necessary and teleports Batman out of the Watchtower. The Justice League then looks down at Earth saddened that Batman decided to leave.
question: Who is stopped by Barman and the rest of Justice League from a robbery?
answer: Royal Flush Gang