"It's going to be hard, because I was so involved in creating the world of Iron Man and Iron Man is very much a tech-based hero, and then with The Avengers you're going to be introducing some supernatural aspects because of Thor," he continued. "How you mix the two of those works very well in the comic books, but it's going to take a lot of thoughtfulness to make that all work and not blow the reality that we've created."
The director also talked about the tie-in for Iron Man 2 and how it might lead into The Avengers.
"We want to reinforce a lot of the stuff we started to tip off," Favreau told MTV News. "The Avengers is a much larger concern for Marvel and Kevin Feige, who runs Marvel. They're going to be doing Thor and Captain America and the way we might start to tease those things in this movie, some of it is stuff that we've discussed [and] some of the stuff you do last-minute as you figure out how that stuff is coming together."
"It's an evolving, amorphous thing," he explained. "If we decide and commit too early, the secret always gets out."
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Iron Man 2 was released May 7th, 2010 and stars Robert Downey Jr., Don Cheadle, Scarlett Johansson, Gwyneth Paltrow, Sam Rockwell, Mickey Rourke, Samuel L. Jackson, Clark Gregg. The film is directed by Jon Favreau.
Marvel's The Avengers was released May 4th, 2012 and stars Robert Downey Jr., Chris Evans, Mark Ruffalo, Chris Hemsworth, Scarlett Johansson, Jeremy Renner, Tom Hiddleston, Clark Gregg. The film is directed by Joss Whedon.