Age of Ultron of 2015 is what I would recall, explosive, even at the beginning as the team chases and fights Russian soldiers in the snow, and where they would later encounter Scarlet Witch and Quicksilver (In somewhat no relation to the X-men universe). The story sets as Tony Stark creates a peace program involving an artificial intelligence which would start gaining his own conscious and the voice of James Spader. As soon as he forms an alliance with Scarlet Witch and Quicksilver, Ultron builds his own robot army that takes over internationally, and the Avengers team will have wrestle with them as well as each other, which would foreshadow the events in Civil War.
This film may have the most CGI-heavy action scenes of any Marvel movie, and they are spectacular. Yet at the same time you might feel it's a bit overstuffed (We're introduced to the Vision, then War Machine comes by, there's Hawkeye's family, I read even director Joss Whedon got exhausted from this movie.) But overall that, it was a lot of fun as Marvel still has more to come. B+