, Clark's abilities increased steadily as he grew up, with super-strength and invulnerability manifesting at an early age and the power of flight developing during high school.His adopted parents revealed the rocket and his foreign heritage to their son when he was 18, leading Clark to the decision that he would become a hero in secret and use his powers to protect innocents.Jor-El administered a serum that would prevent Kal dying due to the biological link with Krypton that the artifact called Eradicator had previously established in each of the inhabitants of that planet (the proximity to their planet was required for them to live; this was why Jor-El and Lara did not leave Krypton; the serum also supposedly would only work in fetuses).
Martha Kent modeled a costume after traditional Kryptonian garb out of his baby blanket, and Clark began operating in his youth as Superboy.
He is visited in this time by Cosmic Boy, Lightning Lad and Saturn Girl of the Legion of Super-Heroes from the 30th Century, an organization of super-powered teens inspired by his legacy.
He is forced to make his first public appearance as Superman, saving both of them when the city is attacked by experimental military helicopters. Growing up in Smallville, Clark shared his secrets with Lana Lang and a relationship has blossomed between them.
He also became friends with Lex Luthor at a very young age.
Mayor Frank Berkowitz deputizes Superman so he can arrest Luthor, and Luthor swears his revenge.
Repeated attempts to murder Superman eventually led to Lex Corp developing an imperfect clone of the Kryptonian named Bizarro.This time he receives a message from his birth parents Jor-El and Lara, learning of Krypton for the first time when Kryptonian technology implants centuries of knowledge in his brain.Superman considers his dual heritage, and decides that no matter where he's from, his life on Earth has made him a human and an American.Jor-El explained that exposure to the yellow sunlight would charge Kal-El cells into living solar batteries and gift him with incredible powers.Just before Krypton finally came to an end his parents sent him to Earth as they planned.Designing a costume after traditional Kryptonian clothing with no mask so the public might trust him, Clark adopts a shy bespectacled appearance to hide his true identity and decides to move to Metropolis.