According to Variety magazine, Robert Downey Jr. was supposed to play the lead role in the 2011 film &#39;Cowboys and Aliens,&#39; but dropped out because of a previous commitment to star in &#39;Sherlock Holmes,&#39; released in 2009.&#40;Pictured: From left, Noomi Rapace, Robert Downey Jr. and Jude Law appear in a scene from the 2011 film &#39;Sherlock Homes: A Game of Shadows.&#39;&#41; <span class=meta>(Warner Bros. Pictures)</span>
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