Born in a multiverse corrupted by the Darkest Knight, the Last Sun is an alternate Superman who was exposed to the cosmic storm of a black hole when his spaceship was traveling to earth. When he reached his destination he was burning with the energy of a million of suns and became a danger for the earth.
The Last Sun was one of the evil Supermen recruited by the Darkest Knight to fight the original Superman and his Superfamily. Allied with the Superiors of the House of El, fought against directlly against the Man of Steel , exahusting Clark powers, but not his spirit.