Superwoman is supposedly the gender-inverted version of Kal-El, the superhero known as Superman, created by Mister Mxyzptlk. As he was not aware of Superman's secret identity, Clara Kent also existed as a separate person.

When he encountered her, Superman mistakenly believed that he had somehow been transported to a world where people that he knew were gender-inverted. However, as it turned out, Superwoman was 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 that he gender-inverted to normal. When that happened, Superwoman ceased to exist.