As the Avengers and their allies have endured to shield the world from threats too large for any one hero to address, a new chance has emerged from the cosmic shadows: Thanos. A despot of intergalactic infamy, his aim is to gather all six Infinity Stones, artifacts of unattainable strength, and use them to inflict his twisted will on all of truth. Everything the Avengers have fought for has led up to this moment - the fate of Earth and life itself has in no way been more uncertain.