VIDEO : What Sets Robert Downey Jr.'s Marvel Contract Apart?

In a recent interview about his 'Avengers' character, The Vision, actor Paul Bettany joked with Hollywood Outbreak, ?I like my character, but I?d love Robert Downey Jr.?s profit participation,?
Downey?s Tony Stark has been the flagship character of the Marvel Cinematic Universe since 2008?s Iron Man brought the shared superhero universe into being.