Justice League: Doom

Justice League Doom is an animated directtovideo superhero film loosely based on Mark Waids JLA story arc, JLA Tower of Babel. The movie was adapted and written by Dwayne McDuffie and is directed by Lauren Montgomery. While not a direct sequel to Crisis on Two Earths, the film uses similar character designs by the lead character designer, Phil Bourassa as well as archived footage from the film in the opening. It was released on February 28, 2012. The film also features various actors reprising their roles from the DC animated universe and Green Lantern Emerald Knights respectively. It is the 13th film in the DC Universe Animated Original Movies line.

The Justice League, with assistance from Cyborg, stop the Royal Flush Gang as they attempt to rob a diamond vault using complex technology that allows them to pass through solid objects. Wonder Woman uses her lasso of truth on the leader to find out who gave them the technology. The leader, despite being under the influence of the lasso, says that he does not know who gave them the technology. Martian Manhunter uses his mental powers to scan the minds of each member of the gang, none of them know the origin of the device. Meanwhile, Vandal Savage plots to exterminate the greater part of the human population and start a new civilization, having discreetly given the technology to the Gang in order to test it. To ensure that the Justice League is unable to stop him, Savage hires Mirror Master, who hacks into the Batcomputer and steals contingency plans devised by Batman to incapacitate his League teammates should they ever go rogue. When Mirror Master asks if he wants him to find Batmans true identity, Savage declines stating that he already knows the true identity of Batman. Savage assembles Mirror Master and a group of other supervillains consisting of Bane, Cheetah, Maalefaak, Star Sapphire, and Metallo with personal vendettas against the heroes and pays them to simultaneously attack the members of the League using the stolen plans, albeit altered to be lethal. When the supervillains agree with Savages plan, he welcomes them to the Legion of Doom.The Justice League retreats to the Watchtower, where Batman reveals that he was the real mastermind behind the attacks with the use of his contingency plans against the League should they become a threat to the world. However, he also had a contingency plan in place should the Batcomputer ever be hacked a tracing algorithm hidden in his files. This enables the League to track down the Legion of Doom. The villains are subdued, but the heroes fail to prevent Savages scheme to orchestrate an apocalyptic cataclysm with a power

Source: Wikipedia