From the introduction:
Doomed planet. Desperate scientists. Last hope. Kindly couple. Superman.
We all know this story by now, don’t we? The story of the Last Son of Krypton, Earth’s Adopted Son, the greatest superhero the world has ever known. Gifted by the light of Earth’s yellow sun, Kal-El (AKA Clark Kent) gained fantastic superpowers as a result of his alien heritage and used them in the name of truth and justice. To protect and safeguard humanity and the blue planet he considered his true home. For years, Superman has fought for these ideals and has remained on the path with determination and dedication, and a hero beloved by many.
And he is dying.