Kara has been a regular character in the Источник material as far back as 1959.

Already a teenager at the time of Krypton's twilight and Kal-El's birth, Kara was the daughter of the scientist Zor-El, Jor-El's brother. He agreed with his brother's prediction that Krypton was doomed, and anticipating this, Zor-El asked Kara to be placed in suspended Анимация and sent to Earth ahead of her infant cousin so that he could have a guardian on their new world. Unfortunately, her rocket was just behind Kal's and was caught in the explosion of Krypton. The rocket was then encased in a Kryptonite asteroid...