The version of Thanos found in the MCU is one of very few superhero movie villains to earn a truly infamous and iconic reputation for their on-screen performance. While Marvel’s prior roster of antagonists had some strong showings, none were so frightening yet so complex as Thanos the Mad Titan, a world-conquering cosmic being defined by his own moral compass and rules of conduct. Indeed, one of the biggest issues the MCU faces in the wake of Thanos’ defeat is just who can replace him, and match both the franchise-defining moments and quotes the intimidating Avengers opponent provided.