I guess what we know about the Avengers is there's a reason why all of the heroes that we've been meeting, from Thor to Captain America - everybody - they need to work together.

But what I've also really liked about it is that it not only has Marvel set about... if they just were slavishly trying to bring the comic books to life, literally, I don't the movies would work, because it's different to see something on screen in three dimensions with actors, and they kind of, I believe, are constantly trying to find a way to absolutely respect the source material and at the same time, transform it into something that works and that you believe on screen.

The world of Ultimate Spider-Man is funny. I can't imagine a live-action film where he's Principal Coulson and dealing with some of the pranks from these guys.

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.

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.

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.

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.