Superboy-Prime

Superboy-Prime (Clark Kent; colloquial: "Prime") is a superhero-turned-supervillain appearing in American comic books published by DC Comics. A boy from the real world transported to the DC Universe, as an alternate version of Superboy, the character first appeared in DC Comics Presents #87 (November 1985) as part of the multiversal crossover event Crisis on Infinite Earths, and was created by Elliot S. Maggin and Curt Swan.

Superboy-Prime originates from the parallel Earth called Earth-Prime (representing the real world) in which superhumans like Superman and other comic superheroes only existed as fictional characters. Shortly before Earth Prime was drawn into Crisis on Infinite Earths (April 1985–March 1986), 15-year-old DC fanboy Clark Kent developed real Kryptonian powers and assumed the identity of Superboy. After his world was destroyed by the Crisis, he was one of the few characters to survive without being folded into the new Post-Crisis timeline, and withdrew with other survivors into a "paradise dimension" from which he was able to observe the new timeline, and the new living versions of fictional characters he had read about as a child.