Robert Downey Jr. on "Iron Man 4" - David Letterman

What does he know about the future of "Iron Man"?

• 2014-10-08T18:10:27+00:00
• Duration: 01:46

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iron, man, marvel, superheroe, super heroe, iron man, david, letterman, robert, downey, jr, talkshow, movie, comic book, comic