Power Girl (real name Kara Zor-L, also known as Karen Starr) is a DC Comics superheroine, making her first appearance in All Star Comics #58 (January/February 1976).
Power Girl is the Earth-Two counterpart of Supergirl and the first cousin of Kal-L, Superman of the pre-Crisis Earth-Two. The infant Power Girl's parents enabled her to escape the destruction of Krypton. Although she left the planet at the same time that Superman did, her ship took much longer to reach Earth-Two.
Possessing superhuman strength and the ability to fly, she is a member of the Justice Society of America and the team's first chairwoman. Power Girl sports a bob of blond hair; wears a distinctive white, red, and blue costume; and has an aggressive fighting style. Throughout her early appearances in All Star Comics, Power Girl was frequently at odds with Wildcat, who had a penchant for talking to her as if she were an ordinary human female rather than a superpowered Kryptonian, which she found annoying.
The 1985 limited series Crisis on Infinite Earths eliminated Earth-Two, causing her origin to change; she became the granddaughter of the Atlantean sorcerer Arion. However, story events culminating in the 2005-2006 Infinite Crisis limited series restored her status as a refugee from the Krypton of the destroyed pre-Crisis Earth-Two universe.
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Official Site: DC Comics
Links: Power Girl Wiki Entry Alan Kistler's Guide to Power Power Girl Online