Robert Downey Jr. is the first movie star to have two successful movie franchises going since Harrison Ford's heyday playing Han Solo and Indiana Jones. As Downey Jr. told Yahoo! Movies' Matt McDaniel, his personality changes a bit when he prepares to play either the famed supersleuth or the billionaire genius turned superhero. "When I'm playing Sherlock, [my wife] Susan Downey says the problem is I start thinking I know everything. As opposed to... more 

Robert Downey Jr. is the first movie star to have two successful movie franchises going since Harrison Ford's heyday playing Han Solo and Indiana Jones. As Downey Jr. told Yahoo! Movies' Matt McDaniel, his personality changes a bit when he prepares to play either the famed supersleuth or the billionaire genius turned superhero. "When I'm playing Sherlock, [my wife] Susan Downey says the problem is I start thinking I know everything. As opposed to when I'm playing Tony Stark, when she says I start believing I am everything." Watch the full interview >> less