Injustice: Gods Among Us is a fighting video game based upon the fictional universe of DC Comics. The game, developed by NetherRealm Studios and published by Warner Bros. Interactive Entertainment for the PlayStation 3, Wii U, and Xbox 360, was released in April 2013.
In an alternate reality, after tricking Superman into killing Lois Lane and their unborn daughter, the Joker destroys Metropolis with a nuclear weapon, killing millions of people. Superman snaps and brutally murders the Joker during Batman’s interrogation. He establishes a new world order as the High Councilor. A war ensues between the forces of Superman’s regime and those allied with Batman’s insurgency. Five years into the war, the insurgency discovers the Justice League’s universe where the Joker’s plan did not succeed and transports several of its super heroes (Wonder Woman, Aquaman, Green Arrow, and Green Lantern) to their world in order to help them defeat the regime, accidentally teleporting Batman and the Joker as well. Batman and 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.
Green Lantern travels to Ferris Aircraft to find a power battery to recharge his ring. After discovering and defeating Raven and Cyborg and subsequently freeing Deathstroke there, Green Lantern returns to Gotham City where he faces Sinestro and his own counterpart, who has joined the Sinestro Corps. He escapes with Wonder Woman and Green Arrow, where they subsequently meet the Batman of this world. Meanwhile, Aquaman heads to Atlantis to see what he can dig up in the Atlantean Archives, learning of Superman’s descent into tyranny. Discovering 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 this alternate timeline’s Lex Luthor, who never became a criminal and is in fact one of Superman’s best friends. 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 Joker allies himself with the Harley Quinn of this world. Together with the Joker Clan, they fight off an attack 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, and the group formulates a plan to rescue Batman.
Once Cyborg and Deathstroke take 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. However, Luthor’s attempt to use the kryptonite weapon is foiled at the last second by Shazam, resulting in Superman killing Luthor. Now knowing of humanity’s determination to depose him, Superman decides to destroy Gotham City and Metropolis to demonstrate the chaos that would arise in his absence. However, when Superman executes Shazam for protesting, the Flash finally accepts 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 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 notes that he hopes Superman never has to learn what he could be capable of while vowing to be there to stop him if Superman ever falls that far. As Superman and Batman leave, the final scene shows a close-up of the other Superman in his prison cell, his eyes glow with fury, indicating he still has some degree of his power.