The Avengers: Doomsday trailer is out. While we still don’t know the precise details of what’s to come in the full movie, aside from that it’s the biggest crossover the Marvel Cinematic Universe has yet to offer, we do know that it’s going to involve quite a bit of cape-on-cape violence. The new trailer shows Avengers and X-Men squaring off, presumably before they realize who their real enemy is and agree to work together.