Infinity War: Which Avenger Will Kill Thanos?

When Avengers: Infinity War hits theaters, the galactic warlord named Thanos, played by Josh Brolin, will leave his space throne and land on Earth, prepared to tear the planet apart to get his hands on the Infinity Stones. What's an Avenger to do when faced with such a threat? The only answer is that the team of Marvel Cinematic Universe superheroes have to kill the mad titan.Is that even possible, though? After all, Thanos practically has the power of a god--and a more powerful one than Thor (C