Superboy is the gender-inverted version of Kara Zor-El, the cousin of Kal-El known as Supergirl.

Superman encountered Superboy soon after meeting his cousin Superwoman, who Superman mistakenly believed was part of a gender-inverted world to which he had somehow been transported. However, as it turned out, Superwoman is simply a creation of Mister Mxyzptlk, who wanted to get even with Superman out of jealousy for him having a happy loving relationship with Lois Lane. When Superman found Mxyzptlk, he forced the imp to say his own name backwards, thus sending him back to the Fifth Dimension and restoring the people he gender-inverted to normal. When that happened, Superwoman ceased to exist, and Superboy was changed back to Supergirl.



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