As Earth's Mightiest Heroes, the Avengers are tasked with keeping the planet and the people who populate it alive. Much of that population lives in cities. So the Avengers are no strangers to urban combat. What happens, though, when a team of immensely powerful alien entities target several of the world's biggest metropolises all at once? How will a team who specializes in uniting to face bigger threats tackle several massive urban conflagrations at the same time? And who are the twisted individuals out to kill Earth's cities?
Source:https://www.cbr.com/avengers-3-jed-mackay-interview/