From throughout time and the far corners of the Multiverse, the Mightiest Heroes of All the Earths are assembling as never before for a battle beyond all imagining. A war that will take us from the prehistoric beginnings of an Earth under assault by the greatest villains who've ever lived to the watchtower that stands at the dark heart of the all and the always, where an army of unprecedented evil now rises. The biggest Avengers saga in Marvel history begins now.