The release of Avengers: Age of Ultron is now less than a month away, and the PR barrage is getting intense.  In the last week we’ve seen a new trailer (see “New ‘Ultron’ Trailer Showcases Black Widow”), and the wrap-up of a massive series of character posters with the Vision (see “Vision Character Poster Revealed” for the full series). 

The latest trailer, first shown for the MTV Movie Awards Sunday night, shows a lot more of the Hulk vs. Iron Man battle, and reveals why it’s happening.

Avengers: Age of Ultron opens May 1.