The very beginning of Marvel Cinematic Universe was helmed by no one other than 'Ironman' portrayed by Robert Downey Jr. Considered as one of the iconic superhero characters of all the time, Robert Downey Jr, breathed life to it. Whenever there is a mention of a superhero no one can forget Ironman and that is the kind of dedication and memorable portrayal Robert associated with the role. The perseverance took the MCU on their decade long-run around the 'Avengers' series.