Supergirl is a legacy name used by women super-heroes involved with Superman and his family. The main and original version is Kara Zor-El, cousin of Superman from Krypton. She has been member of the Justice League and the Legion of Superheroes. The name has also been used by Matrix, a creature that changes shape from a universe, which later merged with a woman named Linda Danvers who develops angelic powers. Power Girl is the Earth-two version. Otto Binder and Plastino created Supergirl, appearing first in Action Comics # 252.
DC Comics, Inc. is is one of the largest and most successful companies operating in American comic books. It was founded in 1934 as National Allied Publications acquiring the name of DC Comics in 1937. The initial «DC» is an abbreviation of Detective Comics, one of the first emblematic titles of the company. It has recently been acquired as a wholly owned subsidiary of AOL-Time Warner. Its headquarters are in New York.