In Marvel Studios' latest crossover epic, Earth's Mightiest Heroes face off against the most formidable foe they've ever fought when Thanos arrives in Avengers: Infinity War. From the film's opening scene he already has the Power Stone, and by the time the opening title plays he obtains the Time Stone as well. But wielding two Infinity Stones does not make him the post powerful villain in the Marvel Cinematic Universe.
