What happens when the Dark Knight and the Man of Steel wake up on a skull-shaped planetoid packed full of cybernetic versions of their entire rogues galleries? Figure out why they re being worshipped like gods, that s what! What is this strange new Brainiac s endgame and how did Batman and Superman s own villain database mutate into this twisted, metallic death planet? The mystery deepens as our heroes allies desperately search for their missing comrades...