Satan Girl is an enemy of Supergirl and the Legion of Super-Heroes. Although the character has gone through of many different incarnations, the original version was an evil duplicate of Supergirl that almost killed all female Legionnaires to sustain her existence. Later incarnations include a 18th century Satanist and an alien death goddess.

Satan Girl was created by Edmond Hamilton and Curt Swan in 1963, first appearing in Adventure Comics #313.

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