>Batman (Armie Hammer) creates a spy-satellite called "Brother Eye" to monitor Earth's superheroes, which is hijacked by his old flame Talia Al Ghul (Teresa Palmer) and corrupt businessman Maxwell Lord (Jay Baruchel).
>Lord and Talia target Superman (D.J. Cotrona), Wonder Woman (Megan Gale), Flash (Adam Brody), Green Lantern (Common), Aquaman (Santiago Cabrera) and the Martian Manhunter (Hugh Keays-Byrne) with nanotech-based weapons, forcing them to retreat to Superman's Fortress of Solitude in the Arctic, where Batman alerts them about the conspiracy.
>The Flash finds out that Lord is the sole survivor of a secret government program that experimented on children with psychic abilities and and wants revenge on Earth's heroes for not protecting him. The heroes confront Lord, who mind-controls Superman into nearly killing Wonder Woman, forcing Batman to break his neck. Lord's mind merges with Brother Eye and unleashes a nanovirus that'll turn everyone on Earth into a hivemind controlled by him.
>The heroes battle Lord's army of robots. Barry taps into the Speed Force and transverses the world at the speed of light, removing the nanobots from every person on Earth and sacrificing himself in the process. Superman then destroys Brother Eye.
>The heroes decide to form the Justice League to honor Barry's sacrifice and defend the world.
