This is the FINAL SCENE of Captain America: The First Avenger. I am about to summarize, so if you don't want to know what happens at the VERY END OF THE MOVIE, do not keep reading, and for goodness sake, do not watch the video.
Captain America (Chris Evans) is revived in modern day New York City after being asleep for seventy years. He meets Nick Fury (Samuel L. Jackson), who introduces him to the Avengers. And then, the movie ends. And then: The Avengers teaser trailer. The clip is a quick glance, but regardless, it's the first we see of Marvel's unprecedented superhero team up. Take a look: