Endowed with powers equal to Superman's, Supergirl splashes down on Earth in the midst of a hail of Kryptonite. No sooner has she landed than the problems begin for the Caped Crusader, who must rescue her when Darkseid nabs her. To thwart Darkseid's plans to make Supergirl one of his Female Furies, Batman must join forces with Superman to confront the powerful enemies Darkseid has assembled around his control center in Apokolips.