The year"s most anticipated blockbuster cosmic event is here, as the Marvel Universe marches towards Infinity! The mad titan Thanos makes his world-shattering return, and his armies fire the opening shots of a galactic war that will be fought both on Earth and in deep space - with our heroes caught between both battles! As Thanos" secrets are revealed, the Inhumans" city of Attilan falls, and the Illuminati find themselves on the front line! And as every Origin Site on Earth goes active, the Builders enter the Marvel Universe.