With Krypton destabilized from mining of the planet's core, Jor-El, chief advisor to Krypton's supreme council, recommends the council give him control of the genetics codex. Before any action can be taken, soldiers led by General Zod, an old friend of El's, launch an uprising and arrest the councilors. Realising that Krypton is doomed, El steals the genetic codex sought by Zod and infuses them into the DNA of his infant son, Kal-El—the first naturally born Kryptonian child in centuries. Donning his old armor, El sacrifices his life to allow his son to escape on a preprogrammed spacecraft. The council quashes Zod's rebellion, and its members are sentenced to exile in the Phantom Zone after being convicted of treason. Krypton explodes soon after.
18 months following the battle between Superman and General Zod in Metropolis, Superman has become a controversial figure and he comes to the attention of billionaire Bruce Wayne, who has operated in Gotham City as the vigilante Batman for twenty years. Adversity brews between this pair of superheroes, escalating to an all out war with one another, until a new threat arises, putting mankind in greater danger and forcing the new enemies to work together.
Fueled by his restored faith in humanity and inspired by Superman's selfless act, Bruce Wayne enlists the help of his new-found ally, Diana Prince, to face an even greater enemy.