Does the world need a Supergirl? With the Daily Planet labeling her a super-tart, and her Kryptonian mother questioning her allegiance, Supergirl is lost, confused and angry. Enter Superwoman...
At first the mysterious super-heroine appears a sympathetic friend to the beleaguered Kara. But when Supergirl's tasked with capturing Reactron-the gold Kryptonite-wielding psychopath who killed her father-it's clear that Superwoman may not be the ally Supergirl believed.

With the burdens of two planets weighing on her, Kara must prevent Superwoman from pitting the people of Earth and New Krypton at war against each other. Will Supergirl be able to prove once and for all that she has earned the right to follow in Superman's footsteps?

Writer STERLING GATES (ADVENTURES OF SUPERGIRL, GREEN LANTERN CORPS) and artist JAMAL IGLE (FIRESTORM) examine what it's like to be most powerful teenager...that nobody wants around. SUPERGIRL- WHO IS SUPERWOMAN? collects SUPERGIRL #34 and #37-42.