<Li> Mark Ruffalo as Bruce Banner / Hulk : An Avenger and a genius scientist who , because of exposure to gamma radiation , transforms into a monster when enraged or agitated . To prepare for the role , Ruffalo worked with motion capture performer Andy Serkis ' The Imaginarium Studios . He stated that his character had grown since the previous film and was `` a bit more complex '' . Ruffalo explained that a confrontation is brewing between Banner and the Hulk saying , `` There 's a very cool thing happening : Hulk is as afraid of Banner as Banner is afraid of Hulk ... and they have got to come to peace somehow with each other . '' While filming in London , Ruffalo said that Whedon still had not given him any of the Hulk 's lines . Whedon later explained that he writes the Hulk 's dialogue spontaneously , saying , `` What makes the Hulk so hard to write is that you 're pretending he 's a werewolf when he 's a superhero . You want it vice versa ... So the question is , how has he progressed ? How can we bring changes on what the Hulk does ? And that 's not just in the screenplay , that 's moment to moment . '' </Li>
<Li> Mark Ruffalo as Bruce Banner / Hulk : An Avenger and a genius scientist who , because of exposure to gamma radiation , transforms into a monster when enraged or agitated . To prepare for the role , Ruffalo worked with motion capture performer Andy Serkis ' The Imaginarium Studios . He stated that his character had grown since the previous film and was `` a bit more complex '' . Ruffalo explained that a confrontation is brewing between Banner and the Hulk saying , `` There 's a very cool thing happening : Hulk is as afraid of Banner as Banner is afraid of Hulk ... and they have got to come to peace somehow with each other . '' While filming in London , Ruffalo said that Whedon still had not given him any of the Hulk 's lines . Whedon later explained that he writes the Hulk 's dialogue spontaneously , saying , `` What makes the Hulk so hard to write is that you 're pretending he 's a werewolf when he 's a superhero . You want it vice versa ... So the question is , how has he progressed ? How can we bring changes on what the Hulk does ? And that 's not just in the screenplay , that 's moment to moment . '' </Li>
who plays the hulk in the avengers age of ultron
who plays the hulk in the avengers age of ultron
Mark Ruffalo
Mark Ruffalo