"A world gone mad! Imagine your deepest, darkest nightmare brought suddenly to life. Imagine the earth itself being transformed at a madman's whim into something insane and unspeakable. Image all this and more and you will only begin to image the power that has been given to the bloodthirsty killer called the Joker by an alien entity known only as The Shaper of Worlds. Such is the monstrous menace faced by the manhunter called The Batman and the man-monster called The Incredible Hulk as they join forces for the first time to save us all from extinction." -- Back cover