Robert Downey Jr. is coming back to the Marvel Cinematic Universe in next year’s Avengers: Doomsday . It’s a big deal because no single actor is as responsible for the success of the MCU as Downey. Had the original Iron Man not been the success it was, we likely wouldn’t be here today, and it’s incredible that the movie worked as well as it did, considering they were basically making it up as they went along.

Robert Downey Jr .'s Tony Stark is absolutely one of the coolest characters in the MCU, and you can tell because he’s often wearing sunglasses, an accessory that he wears significantly more than most of his Avengers buddies. It turns out the reason for the glasses, at least in one key scene, was as much for function as fashion, as Downey once told Vanity Fair he wore them

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