Mark Ruffalo Admits He Was Scared About Joining 'Avengers' as The Hulk

Mark Ruffalo was once hesitant about joining the Marvel Universe and playing The Hulk in the Avengers franchise. However, the 52-year-old actor revealed that it was co-star Robert Downey, Jr., who convinced him he could do it. “I was scared,” Mark confessed to Jimmy Fallon during a The Tonight Show appearance, airing tonight, May 8