Online Injustice Gods Among Us (2013)

by accident to their world in order to help them defeat the Regime. Batman and the Joker are confronted by the Regime in a dystopian Metropolis, but Batman uses his gear

 to help them both escape and go their separate ways. Having arrived in this world, attempting to learn what has happened, Aquaman travels to Atlantis to research the archives while Green Lantern goes to recharge his ring. After discovering Raven and Cyborg torturing Deathstroke, Green Lantern faces Sinestro and his own counterpart, who has defected from the Green Lantern Corps to join the Sinestro Corps. He escapes with Wonder Woman and Green Arrow to Gotham City, subsequently meeting the Batman of this world. Learning that Atlantis has agreed to a treaty that puts Superman in total control of Atlantis, Aquaman rejects it, defeating the Flash, Shazam and his own counterpart before Ares appears. Acknowledging that he is weakened by the lack of conflict, Ares sends Aquaman to join the Insurgents, which includes a Lex Luthor who never became a criminal. Batman explains that he has a kryptonite weapon that can defeat Superman in the Batcave, but it requires DNA samples from the other four heroes to unlock, as Batman wanted to ensure he could not make the decision to stop Superman by himself. The heroes from the other universe became necessary after Green Arrow died trying to reason with a grieving Superman and the other three aligned with his new regime. The displaced Batman is captured by the Regime and the Joker allies himself with the Harley Quinn of this world. After Harley's gang, the Joker Clan, is attacked by Regime forces led by Nightwing and Hawkgirl, they are rescued by the heroes, who travel to the Batcave to recover the weapon. Meanwhile, back in the Justice League's universe, Superman, the Flash and Cyborg attempt to recover their comrades, but their attempt accidentally sends Cyborg to the alternate reality. Cyborg overhears Lex Luthor and Deathstroke discussing plans to defeat Superman, prompting a brief clash before the other displaced heroes explain the situation to him. With Cyborg and Deathstroke ha her counterpart before convincing the Amazons to return to their former role as protectors rather than conquerors. As the battle begins, Batman convinces his counterpart to have faith in their Superman just as he had faith in the other displaced heroes. Superman arrives in this world in time to defeat several members of the Regime while Wonder Woman's Amazons hold back the armies of Atlantis. After defeating Doomsday in the Fortress of Solitude and trapping him in the Phantom Zone, Superman faces his counterpart, rejecting his other self's attempt to defend his actions as enforcing authority over an unworthy humanity and informing him that Lois would be afraid and disgusted at what he has become. With the other Superman's defeat, the rest of the Regime are either rounded up or turn themselves in and the other Superman is placed in a prison where he is exposed to red sun radiation, negating his powers. The displaced Superman acknowledges that he could have become his counterpart under the same circumstances, but Batman merely grimly notes that he hopes Superman never has to learn what he could be capable of while vowing to be there if Superman ever falls that far. As Superman and Batman leaveving taken control of the teleportation system on the Watchtower, the heroes stage a break-in on Stryker's Island and rescue the displaced Batman from his planned execution, but Luthor's attempt to use the kryptonite weapon against Superman fails, resulting in his death. Overhearing humanity's newfound fear of him, Superman decides to destroy Gotham City and Metropolis to demonstrate the chaos that would arise in his absence. However, when Superman kills Shazam for questioning him, the Flash realizes that the Regime has gone too far and defects to the Insurgents. With the kryptonite weapon rendered useless, the dimensionally-displaced heroes suggest recruiting the Superman of their world to stop this one, only to be interrupted by a Regime attack on their hideout. During the fight, Wonder Woman is teleported to Themyscira by Ares, who reveals that Superman's plan will be carried out by an army of Amazons. He desires to stop this plan, as Superman's victory will mean an end to the conflict that empowers him. Accepting his advice, Wonder Woman defeats, the final scene shows a close-up of the other Superman in his prison cell, his eyes glowing indicating he still has some degree of his power.