Superman / Batman

Buried alive by Metallo, Batman uses explosives to blow an opening into the Gotham sewers, shielding himself behind Superman's body. The two make their way through the sewers to the Batcave. Alfred removes the kryptonite bullet, and Bruce learns that Metallo may have been the man who murdered his parents... before Clark gets a chance to tell him. As the two argue, a Boom Tube opens, and an older version of Superman steps out, and tries to murder his younger self. Can the world's finest team stop a raging Man of Steel?Meanwhile the government under President Luthor is attempting to destroy a mass of Kryptonite the size of Australia that is set on a collison course with the Earth. Luthor blames Superman for the rock's trajectory, and offers a one billion dollar bounty to anyone who can bring Superman in to face justice.