There have been many iterations of Supergirl over the years, some of them better than others.
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The Supergirls: Every Iteration of Supergirl, Ranked
Is Supergirl stronger than Superman in the comics? If so, why is
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Supergirl: 5 Reasons James Olsen Was Kara's Best Love Interest
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Supergirl Just Terrified Superman's Most Powerful Enemy - Here's How
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The Superman is Dead, Long Live the Supergirl – Multiversity Comics
