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.

I was a football player at college and dislocated my thumb. I was out for a bit and passed the theatre and saw some lovely drama students walking into an audition for 'Much Ado About Nothing' and thought: 'That's what I'll do when I recover.' I joined that production and was hooked.

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.

It was cool to me, as a fan of the comics, to see some of the villains that end up finding them there, and the way that they abuse Coulson before the superheroes come. I'm always, in the movies or in the animated series, getting into trouble that a superhero has to bail me out of.

There's always changes in the way they do that in the cinematic universe. I think, with the S.H.I.E.L.D. 2.0, you're seeing some of the first ripples of those different points of view on what S.H.I.E.L.D. should be when it's rebuilt. I'm very, very curious to know which side Coulson will end up on in that struggle.

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.

When Marvel put together Ultimate Spider-Man and someone came up with the idea of having Principal Coulson, they said, "Do you want to do the voice?" I thought, "I have to do the voice!" Because I have a daughter and we watch some cartoons, I couldn't bear the idea of tuning in and hearing somebody else's voice.