'Iron Man 3': The 'Top-Secret' Story Behind Mark Ruffalo's Cameo

'No one could know who Robert was working with that day,' the Hulk himself tells MTV News of teaming with Robert Downey Jr.
By Todd Gilchrist, with reporting by Tami Katzoff

Source: http://www.mtv.com/news/articles/1707283/iron-man-3-mark-ruffalo-cameo.jhtml

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