Marvel just dropped a chill-inducing, head-explosion of a trailer for next year's Avengers:Infinity War and people on Twitter are totally losing their minds. The trailer is quite grim as our heroes band together to battle Thanos in an epic multi-world war. While we're happy to see a ton of familiar faces, the Avengers don't seem very confident that they can stop our villain. We're not ready to say goodbye to any of these heroes. Folks on Twitter seem to agree.