As a fanboy myself, one of the fun things about the gig has been every time I get a new script, I get to find out more about his day - to-day life and what goes on and what his relationships are.

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.

Because I'm stern and scolding [the characters] sometimes, I'm sure I'll get a ton of grief.

When I was backstage at Comic-Con, about to go out and do the panel for Thor, and Joss Whedon ran up and introduced himself, I already almost passed out, right then. And then, he said, "I've been meaning to call you. You have a big part in The Avengers. Can we introduce you as part of the cast?" It was pretty Make-A-Wish Foundation. I was pretty sure I was dying and nobody had told me yet.

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.

I'm not in Captain America because it takes place in the '40s. Both he and Bruce Banner are relationships that evolve during this - two more rock stars that I got to get on stage, ready to play ball.

It's a little strange, after all these years of working on camera, but once you start to watch the other people who do this a lot and realize how much of what you're doing has to just come through your voice, I found it really interesting.