Kara Zor-El is the heroine known as Supergirl. Born on Krypton to Superman's uncle and aunt, Kara was rocketed to Earth by her father to save her life. She was adopted by the Danvers family and became the protector of the town of Midvale and National City. In her secret identity she is Kara Danvers. With her Kryptonian powers, Supergirl is one of the most powerful heroes in the world, and has been a member of the Justice League. Kara was born in Argo City to Zor-El and Alura In-Ze. During Kara's naming ceremony, her uncle Kru-El attempted to end her father and her uncle, Jor-El, intending to take control of the House of El. However, the attempt failed, and Kru-El was sentenced to the Phantom Zone. As she grew, Kara developed a keen interest in history. As such, she became an avid student of the teacher and historian Catar-Ol. Argo City survived Krypton's destruction as a result of the efforts of her father, though many of its citizens perished. Though her mother Alura survived the initial destruction, she eventually fell ill and died as a result of radiation poisoning as the minerals in the soil beneath Argo slowly became Kryptonite. Ever the scientist, Zor-El created a solution; he would mass-produce lead shields and spread them over every inch of exposed land in Argo. Every hand was required to complete this massive task, including Kara's. She put so much effort into it, even hurting herself to keep up adrenaline. Only five thousand citizens survived out of the initial eighteen thousand, and many who survived were still slowly dying of radiation exposure from before the lead shield was completed. She continued to survive in the slowly dying city, living a relatively solitary life. However, as stellar debris hit the exterior of the unsteerable Argo, it penetrated the city's air bubble, and asteroid fragments rained down on the city, penetrating the lead shield they had struggled so hard to build. Her father luckily had built a ship to fly Kara off the city, but only her. She was reluctant, but her father wouldn't take no for an answer. So she was sent away. Kara eventually arrived on Earth at some point during the early years of her cousin Superman. She discovered that her ship went off course and she was stuck in space for years, and her cousin Guest was growing. He was a superman, and she was a supergirl. Krypton's red sun had suppressed her races powers, while Earth's yellow sun enhanced them.