The future begins in the past! It's a clash of the titans in the 11th century, as Thor battles Apocalypse! The Avengers' ancestors are being hunted and only a young Thor can save his future companions! And with Rama-Tut and Kang pulling the strings, you know nothing good can come from any of it. And in the present day, the beginning of the end looms...as the Apocalypse Twins debut! Why do they seek to anger the Celestials? What is their connection to Kang? As S.W.O.R.D.'s Peak station is attacked by Apocalypse's Ship, a Celestial meets a fate so shocking, so impossible, it will rock the Marvel Universe to its core. Now begins Ragnarok...and it's all Thor's fault!