There may be a day when Kara Zor-El is ready to leave the Supergirl mantle behind for good, but an upgrade to 'Superwoman' might not be that easy. Despite it being the most obvious choice, the Superwoman mantle has quite a dark history unbefitting of a hero like Kara.
After she survived Krypton's destruction and eventually made her way to Earth, Kara discovered that her baby cousin was now a full-grown man and the planet's number one protector. Like Superman, Kara developed powers thanks to the yellow rays of the sun and she became a hero just like Clark. Supergirl and Superman protected Earth together for years, and what started as two Kryptonian heroes eventually grew into an entire family. In that time, Supergirl has seen others take on new identities as they got older, such as when Jon Kent abandoned the Superboy title to take on the name Superman in record time.
Related: Conner Kent Earned the Superman Mantle Long Before Jonathan Kent
But if Kara's been around for as long as she has, why is she still going by Supergirl and not Superwoman, a more age-appropriate name? As it turns out, that name has some particularly dark baggage. That fact came to light in Supergirl #40 by Sterling Gates and Jamal Igle. After the Bottle City of Kandor was resurrected, Kara came into contact with a powerful woman who wore the Super Family's «S» shield and called herself Superwoman. Though Kara is unsure of the stranger's identity, the stresses of the mounting tensions between Earth and New Krypton cause Supergirl to confide in Superwoman. However, unbeknownst to Kara, Superwoman is actually Major Lucy Lane (Lois Lane's younger sister) who has been acting on her father, General Sam Lane's, orders as part of his plans to neutralize the
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