Robert Downey Jr. has impressed most fans with what they have seen of his Tony Stark in trailers for Iron Man, but of course we all want to know more. Fortunately, MTV caught the actor at ShoWest, and managed to get a few details about the upcoming film out of him.

First, Downey was asked about what was the most difficult part of creating the mindset for Tony Stark. "It's the fact that, at a certain point, he stops living under this veil of self-importance and disregard for moral psychology, and he decides to do something. And that's what I usually hate about these movies - when suddenly the guy that you were digging turns into Dudley Do-Right, and then you're supposed to buy into all his "Let's go do some good!," that Eliot-Ness-in-a-cape-type thing," Downey said. "What was really important to me was to not have him change so much that he's unrecognizable. When someone used to be a schmuck and they're not anymore, hopefully they still have a sense of humor."

Another vital aspect of the character, and one hinted at in the film, is that Tony Stark will eventually struggle with alcoholism. Asked about this, Downey replied "Oh yeah, that's always been an important part of the character - at least it was when the "Demon in the Bottle" comic series came out. I think it was in the '80s. That was a big, risqu&#233 thing to do. I can think of a bunch of different ways we can explore that and make it entertaining and poignant. We'll see."

Downey also talked about the "cross-over" scenes between Iron Man and The Incredible Hulk. "We were just cross-pollinating our superheroes. It happens to be a scene where I basically approach [his character, General Ross], and we may be considering going into some sort of limited partnership together," Downey said. "The great thing is he - and I don't want to give too much away - but he's in disrepair at the time I find him. It was really fun seeing him play this really powerful character who's half in the bag." Downey also hinted about what may be Samuel L. Jackson's cameo appearance as Nick Fury. "It's like the same thing we did with a hitherto-unnamed star, who will probably appear in the end credits of Iron Man." However, when asked to clarify who that actor might be, Downey laughed. "I am not at liberty to say. [Laughs.] I could probably look around this corner and see the presidents of Marvel within 50 yards."

Finally, Downey was asked about what he would like to see in a sequel, and he was quick to respond. "Well, I don't know if it's so much the nemesis that I would think about as much as what the character's genesis is and what kind of technology [he acquires]. Where do you find him at the beginning, and where does he have to go at the end? Because you still want to save space for the next. But very few fans, me one of them, would [disagree] that Mandarin was probably Tony Stark's greatest nemesis. Mandarin is badass."

The Incredible Hulk, starring Edward Norton, William Hurt, Liv Tyler and Tim Roth smashes into theatres on June 13, 2008.