Robert convinced him to play 'Hulk'

Actor Mark Ruffalo says 'Iron Man' star Robert Downey Jr. convinced him to defend myself against the role of the 'Hulk' aka Bruce Banner and join the Marvel Cinematic Universe (MCU) in 'The Avengers'.The actor, who has been a fundamental element of the MCU since 2012, made the revelation during an online appearance on Jimmy Fallon's chat show. "I was scared," Ruffalo said of stepping in to the role, which had previously been played by Edward Norton in 2008's 'The Incredible Hulk', Eric Bana in 2003's 'Hulk' and Lou Ferrigno in the 1970s TV series."I didn't know very well what I could increase what I already thought had been done so prior to me. And I had only been doing indie movies up compared to that point therefore i was like I have no idea if I am the proper person for this role," he added.