After assisting in saving a group of astronauts from the approaching black hole Solaris, Superman is over-exposed to the sun, and given weeks to live. He exposes his identity to Lois, and decides to live out the rest of his days as family man Clark Kent. Meanwhile, Lex Luthor becomes aware of the disappearance of Superman, and decides to use his own technology and metahumans to become the new hero of Metropolis, and to become Mayor to stop investigations into LexCorp. Superman will have to regain his strength to save Metropolis, the world, and himself.