Post-Crisis Versions
DC Editorial wanted Superman to be the only surviving Kryptonian following DC's post-Crisis reboot of the Superman continuity. As a result, when DC reintroduced Supergirl, she needed a non-Kryptonian origin. Afterward, DC Comics tried to revamp the Supergirl concept, introducing several more non-Kryptonian Supergirls. Eventually, the rule that Superman should be the only Kryptonian survivor was relaxed, allowing for a return of Kara Zor-El as his cousin.
Read more about this topic: Supergirl
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“The assumption must be that those who can see value only in tradition, or versions of it, deny man’s ability to adapt to changing circumstances.”
—Stephen Bayley (b. 1951)