https://techcrunch.com/2018/12/07/avengers-endgame-trailer/

If you’re reading this post, you probably want to watch the first trailer for the new Avengers movie. So go ahead, watch it. I’ll wait.

The trailer doesn’t show much that viewers of “Avengers: Infinity War” hadn’t already guessed (spoilers!): Namely, that the villain Thanos has succeeded in his plot to eliminate half the population of the universe, including a big swath of the Avengers cast. But Captain America and the remaining heroes have a desperate plant to get everyone back.