While Superman is out bringing peace to Mars, Supergirl is out in Argo City saving people, falling in love with Jimmy Olsen and hiding her identity. She then discovers a part of Brainiac's destroyed ship in the ocean. It is a laboratory containing darker secrets of Brainiac's war against Krypton. Supergirl finds her own father, Zor-El now transformed into Cyborg Superman! When he awakens he flies away and annihilates everything in sight! Can Supergirl win this fight and save the city while Superman is away?
