What happens in batman v superman movie?

Batman v Superman: Dawn of Justice follows Bruce Wayne (Ben Affleck), who has grown disillusioned with Superman's unchecked power after the destruction in Man of Steel. Convinced Superman is a threat to humanity, Batman prepares for a final confrontation. Meanwhile, Lex Luthor (Jesse Eisenberg) manipulates both heroes, aiming to turn public opinion against Superman and using kryptonite to weaken him. The film begins with a mysterious attack in Metropolis that leads Batman to target Superman, culminating in their intense fight in an abandoned warehouse. As their battle intensifies, Luthor's scheme unfolds: he plants evidence suggesting Superman will destroy humanity and secretly creates Doomsday, a monstrous kryptonian creature. Superman and Batman are forced to work together to stop Luthor's plan, leading to their first-ever team-up in combat. The film ends with the death of Superman during the battle with Doomsday, and Batman discovering a hidden message from Martha Kent, which helps forge an uneasy alliance between the two heroes.