Supergirl v06 - Who is Superwoman (2009)

After encountering the mysterious Superwoman during the "New Krypton" stroyline, Supergirl is left with two burning questions: who is Superwoman, and what gives her the right to wear the symbol of the House of El? The answers lead Supergirl into the darkest depths of New Krypton and drastically alter the Superman family forever!
Collects Supergirl (2005-2011) #34, 37-42.