Superman II to Jor-El and General Zod. He finds Zod at the White House and tells him Superman is the son of Jor-El, their jailer, and offers to lead him to Superman in exchange for control of Australia. The three Kryptonians ally with Luthor and go to the offices of the "Daily Planet". Superman arrives, after having found the green crystal that restores his powers, and battles the three. Zod realizes Superman cares for the humans and takes advantage of this by threatening bystanders. Superman realizes the only way to stop Zod and the others is to lure them to the Fortress.
Superman II approached Donner to see if he wished to be credited as co-director, in which Donner replied, "I don't share credit". Composer John Williams was originally slated to score "Superman II" in which he was given a screening with Ilya Salkind and Richard Lester. When Salkind left the projection room, Williams and Lester fell into an argument, and when Salkind returned, Williams told him that he "could not get along with this man". To take his place, Richard Lester's frequent composer Ken Thorne was selected to score the sequel. Thorne wrote minimal original material and adapted source music, such as Average