For me, one of the really cool things about this is that throughout these movies, there have been - and I enjoyed it this way - hints at what S.H.I.E.L.D. is and how they function within this Marvel movie universe which, as you know, is deeply based in the comic books.

The great thing about Coulson is that he's a little bit like a party game, where the next person who gets ahold of him gets to write another sentence. I'm constantly learning more and more about the guy.

Joss Whedon and all the writers of 'Iron Man' and 'Thor' found a way to keep Coulson saying something that keeps you guessing. I'm really lucky because a lot of people play agents and don't get nearly as much fun stuff to do.

The hardest thing to get right is to figure out how to bring all those characters together, and to fulfill the promise of The Avengers. They really set a very high bar for themselves because you've been setting this coalition up, for these five movies, and they better deliver. And in my opinion, they thoroughly deliver.

I felt like people really do their best work when they're having a really good time and feel safe to push the envelope and make a jackass out of themselves.

What I love about Coulson is that he manages to do that and he manages to wrangle the diva superheroes, and really keep a sense of humor about it. And, you can tell that he really loves his job.

The technology actually seemed to come at just the right time to make the Hulk - Mark Ruffalo was really able to play both characters.