After spending more than half a decade building up Thanos as the Infinity Saga's end of level boss, Avengers: Infinity War needed to make sure that the Mad Titan lived up to the hype. Any doubts were dispelled by the end of the very first scene though as the genocidal maniac beat the Hulk to a pulp with his bare hands and killed off popular Asgardians Heimdall and Loki before the action had even reached Earth.