In the aftermath of a destructive battle between Superman and General Zod that leaves parts of Metropolis in ruins, the world grapples with the presence of Superman and his unchecked powers. Billionaire Bruce Wayne, who has secretly been fighting crime as Batman in Gotham City for years, sees Superman as a potential threat to humanity and becomes obsessed with stopping him. As Superman continues to perform acts of heroism, the intensity of public opinion is split, with some deeming him a savior while others view him as an alien danger.

As Batman prepares to confront Superman, a new malevolent force arises. Lex Luthor, the cunning and ruthless head of LexCorp, sees an opportunity to exploit the growing rift between the two heroes for his own gain. He manipulates events to pit Batman and Superman against each other, all while conducting a series of malevolent experiments and creating a monstrous threat that could endanger the whole planet. As the two iconic figures collide, the struggle for justice becomes more complicated, with the nature of heroism being questioned by society and by the heroes themselves.