Although +Marvel Entertainment hasn't conformed the report, Variety states 'Captain America 3' will be based on the 2006 Marvel Comics storyline 'Civil War'. If you're not familiar, 'Civil War' saw Marvel's superheroes taking sides over something called 'The Superhero Registration Act'. On one side was Captain America and his supporters, who opposed the Act, and on the other side was Iron Man and his crew, who thought the Act was a good idea.
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Marvel Civil War: Robert Downey Jr. agrees to major role in 'Captain America 3' (EXCLUSIVE) http://t.co/ejRldwysLD pic.twitter.com/VBvx8GhbrI
— Variety (@Variety) October 14, 2014