Kara Zor-El is a survivor of Argo City, which survived explosion of planet Krypton & drifted through space. When inhabitants of the colony are slain by Green Kryptonite released by meteorites striking the lead barrier, Kara is sent to Earth by her parents Zor-El and Alura In-Ze to be raised by her cousin Kal-El (Superman). Supergirl's identity is a closely held secret known only to Superman, her foster parents, and the Legion of Super-Heroes, of which she is as a member for a time. Supergirl is also vulnerable to Kryptonite. Streaky, her orange cat, acquires temporary superpowers as a result of its exposure to "X-Kryptonite" Supergirl accidentally created in an unsuccessful attempt to neutralize the effects of Green Kryptonite. Comet the Superhorse, a former centaur, is Supergirl's equine companion.
On Earth, Kara acquires powers identical to Superman's, adopting the secret identity of Linda Lee, a resident of Midvale Orphanage. She conceals her blonde hair beneath a brunette wig and functions as Supergirl only in secret, at Superman's request, until she can gain, in his opinion, sufficient control of her powers. After she is adopted by Fred and Edna Danvers, Superman decides his cousin is ready to begin operating openly as Supergirl. She attends Midvale High School as Linda Lee Danvers.
In later years, after graduating from Stanhope College, she changes careers several times, holding jobs in student counseling, news reporting, and acting in a TV soap opera titled Secret Hearts. She also attends college in Chicago. Kara has many boyfriends, including Richard (Dick) Malverne, Jerro the Merboy from Atlantis, and Brainiac 5, a member of the Legion of Super-Heroes.
SUPERGIRL'S FAMILY:
Zor-El, the younger brother of Jor-El, is a scientist who invents the dome over Argo City & oversees the placement of lead shielding over the ground of Argo City, thus enabling the city's residents to survive the explosion of Krypton. The city drifts in space for 15 years, residents clinging to a precarious existence. Zor-El and Alura In-Ze's daughter Kara is 10 when Argo's lead shielding is punctured by meteors, releasing deadly Kryptonite radiation. Her parents send Kara to Earth in a rocket ship after Zor-El had observed, using a powerful electronic telescope, a super-powered man resembling his brother Jor-El, wearing a uniform of Kryptonian styling. They conclude the man is probably their nephew, Kal-El, sent through space by Jor-El when Krypton exploded and now grown to adulthood. In later Silver Age accounts, Zor-El and Alura In-Ze survive the death of Argo City when, shortly before the radiation reached lethal levels, Zor-El projects them both into the immaterial Survival Zone, a separate dimension resembling the Phantom Zone; later they're released from the Zone, living in the bottle city of Kandor, preserved in microscopic size at Superman's Fortress of Solitude. In Silver Age version of the continuity, Supergirl could regularly visit with both her adoptive parents, the Danvers, and her birth parents.
... SuperGirl's character was created by writer Otto Binder and designed by artist Al Plastino in 1959...
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