

When she grew old enough, Kara moved to Metropolis' sister city, National City, and began working for the Department of Extranormal Investigations with her adopted sister Alex. She also became friends with Daily Planet photographer Jimmy Olson, who she would later begin dating. Though she publicly admitted to her shared lineage with the Man of Steel, she kept her identity secret and would only share it with a select few. After weeks learning to control her powers and get use to the planet's society, she was placed in the care of the Danvers family and began helping Superman as "Supergirl".

Having discovered the Phantom Zone during a battle with General Zod, Superman brought Kara to Earth in the hopes of getting other Kryptonians to adapt to the planet's environment and help him fight of threats to it, knowing that he may not be able to fight some threats alone. After being trapped for what seemed like days to her, she eventually was saved by Kal-El, now much older and operating as the superhero Superman. Having left the planet later than Kal, Kara caught in the planet's after blast, which caused her rocket to be directed into the Phantom Zone. Like him, she was placed into an escape pod by her parents and shot into space, hoping that she would survive the blast. Kara, unlike Kal, was born and raised on the planet in the years before its destruction, due to the planet's unstable core.

Though technically older than Superman, she is appears younger than him, due to events surrounding her evacuation for Krypton. Supergirl's true identity is Kara Danvers, though she is known to fellow Kryptonians as Kara Zor-El.
