At a certain point people want to see other movies besides comic book movies so you have to be really careful what you're going to pick, and how many are going to be released within a year.

I've never produced a series, so for me [X-men] was a wonderful challenge.

When I originally sold X-Men it was because I knew there was 40 years of stories. That was the point! Not only to do the movie and establish the characters, you know, you love the one you're doing. It was because there are all these great stories, what a wealth of drama.

What I'm always afraid of is going "off-book,I always get upset when the director leaves the classic comic that was so very popular. I argued, and I won't say with who about what, but when we go way away from the original source material... that material is popular for a reason and I like to stick with it.

In the Marvel world, some characters have similar powers. Initially some people might bump up against it, but if they really looked into the X-Men world they would see that characters do share similar powers.

At a certain point people want to see other movies besides comic book movies so you have to be really careful what you're going to pick, and how many are going to be released within a year.

We just don't want to repeat anything that we've done in the movies [X-man] or that we're going to do in the movies. There's so many stories to tell, we just want to stay out of each other's way.