Dr. Leo Quintum and his team are exploring the Sun when they are sabotaged by a booby-trapped genetically-enhanced time-bomb clone made by
Lex Luthor.
Superman stops the clone but in doing so receives an overdose of solar radiation; it has given him increased powers, but is slowly killing him. Luthor is arrested thanks to Clark Kent's article and sentenced to death. Wanting to spend as much time as possible with
Lois Lane, Superman reveals to her that he is Clark Kent, and takes her to the
Fortress of Solitude. During this visit, Superman's secretive behavior and her indirect exposure to alien chemicals heightens Lois' paranoia. Superman is able to calm her, explaining his caginess was to hide her birthday present, a serum granting her superpowers for 24 hours. Unbeknownst to anyone, Luthor reprogrammed one of the Fortress'
robots to steal the serum Superman made for Lois' birthday. Luthor gains Superman's powers, enabling him to survive execution by electric chair. Superman learns that Luthor's secret ally
Solaris has betrayed him by turning Earth's sun blue. With his robots, Superman engages Solaris in space. However, all seems lost until Superman's pet
Sun-Eater sacrifices itself to weaken Solaris, which allows Superman to destroy it. Clark returns to the
Daily Planet, very ill, and collapses upon completing his article, "SUPERMAN DEAD". When the staff tries to save him, they realize that he has stopped breathing and his heart has stopped. Luthor arrives and attempts to kill Lois. Clark revives and fires a gravity gun at Luthor. As his powers fade, Luthor briefly sees the world as Superman does and weeps as he gains a measure of understanding. Luthor wishes the experience to continue, but when he reaches for his next vial of serum, he realizes that Superman has stolen his supply. Superman destroys the serum over Luthor's protests, pointing out that if Luthor truly cared about solving the world's problems, he would have done so long ago. Luthor somberly admits Superman is right. With Superman's body starting to turn into pure energy, he proclaims his love for Lois and gives her his cape as a way to remember him before he leaves and flies into the sun, seemingly sacrificing himself to save the Earth. Quintum visits Luthor in his cell. Now enlightened from his ordeal and accepting his impending death, Luthor presents Quintum with the only thing that could redeem him for his actions: a formula to recreate Superman's genetic structure through a healthy human ovum. ==Cast==