This video shows the Hulk catching Iron man just before he hits the ground at about the 3:10 mark.
I assume that must be a "classic" story from one of the comic books. They are also fighting giant robots in this video below.
(What is it about all these robots coming from outer space)? Is the Annunaki coming to Earth? Is that why all these movies KEEP talking about enemies from outer space?
Avengers VS. Transformers? (why didn't they just call it Avengers vs. Transformers)
Also the movie trailer pretty much just REVEALED the entire movie inside of 2 minutes.