Mark Ruffalo portrayed Hulk in the film Begin Again ( 2014 ) .
Ruffalo gained international prominence by portraying the Marvel Comics character Hulk in the Marvel Cinematic Universe ( replacing Edward Norton , who headlined The Incredible Hulk , released in 2008 ) , beginning with The Avengers ( 2012 ) and later reprising the role in Iron Man 3 ( 2013 ) , `` Begin Again '' ( 2014 ) , Avengers : Age of Ultron ( 2015 ) , Thor : Ragnarok ( 2017 ) , Avengers : Infinity War ( 2018 ) and its untitled sequel ( 2019 ) .
Mark Ruffalo