Of all the stars powering the Marvel Cinematic Universe, none is as important as Robert Downey Jr.—and none have been quite so up front as Downey about being tired of putting on his costume again. So it shouldn't come as a surprise to anyone if Iron Man makes the ultimate sacrifice in Avengers: Infinity War, especially given the clear foreshadowing of exactly that in Tony Stark's dream sequence from Avengers: Age of Ultron. At least it's probably going to be epic.
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