In the aftermath of ONE WORLD UNDER DOOM, with Doom's castle empty and masterless, the superpowers of the world race to claim and control the untold power and technology that await inside. But when an explosion sends them all plummeting into a dungeon labyrinth that none of them knew was there, what began as an arms race becomes a terrifying game of survival. Who, if any, will survive? And what horrors lie within the DUNGEONS OF DOOM?