The plot of Avengers 4 is being kept top secret.<br />The as-yet untitled film will usher in the next phase of Marvel Cinematic Universe.<br />ComicBook.com said the film will be released May 4th.<br />There is still a lot fans don't know, such as the fate of the heroes who died during 'Infinity War,'<br />There is speculation that Brie Larson's Captain Marvel is the key to saving the world in Avengers 4.<br />Larson will debut as Captain Marvel in March 2019. <br />
