Superman: Year One #1

Sent in a rocket from the planet Krypton before it exploded, Kal-El arrives on Earth and is adopted by the Kents. Growing up as Clark Kent, he learns to control his powers so as not to hurt anyone. That is put to the test when Clark stands up to school bullies who are picking on his friends. When the bullies threaten Lana, Clark stops the bullies, and develops a romantic relationship with Lana. At graduation, Clark enlists in the Navy and leaves Smallville.