Supergirl is a fictional super-heroine appearing in American comic books published by DC Comics. The character was created by writer Otto Binder and designed by artist Al Plastino. Supergirl first appeared in a story published in Action Comics #252, May 1959 titled “The Supergirl from Krypton”.
Kara Zor-El is the biological cousin of Kal-El (Superman). During the 1980s and the revolution of the Modern Age of Comics, Superman editors believed the character’s history had become too convoluted, and desired to re-establish Superman as “The Last Son of Krypton”. Supergirl was thus killed during the 1985 limited series Crisis on Infinite Earths and retconned out of existence. In the decades following Crisis, several characters unrelated to Superman used the Supergirl alias.