Avengers 2: Andy Serkis Talks Behind The Scenes Work on Ultron and Hulk in Age Of Ultron

Andy Serkis who plays Ulysses Klaw in the upcoming Avengers movie, is also responsible for bringing characters like the villain Ultron and Hulk to life.

Andy Serkis' The Imaginarium, works with visual effects companies on motion capture.

In a recent interview with Empire Magazine, Serkis spoke of making characters like the Ultron and the famous Hulk 'roar'.

"We did some work on Ultron. On the development of Ultron, before James Spader came on board," Serkis said.

"In terms of movement styles: Was he gonna be human-like? Was he gonna be robot-like? So we worked with a bunch of different people, from body-popping experts to dancers, to this guy called Neil who's nearly eight feet tall... We gave Mark weights, we had voice projections so he could do his Hulk roar."

He continued, "On screen we could have a virtual representation of the low-res avatar of The Hulk, so he could come out and feel that sense of scale."

Serkis also revealed that he is just as happy working behind-the-scenes as he is in front of the camera.

"It's a journey I end up going on with the actors," he said.

"To find out what they want to get out of it, and what we can do to help them so it's still them authoring the role. Initially when you're asking them to put a grey suit on, they're not very into the idea. But it's usually within the first hour, when they can see the result of them being in that suit [on screen] in real-time, they settle in. And then they've lost themselves in our world. James in particular - he loved every minute of it," Serkis added.

Andy Serkis plays the Marvel villain Ulysses Klaw, in Avengers: Age of Ultron.

Klaw is a physicist with a mastery of sound who debuted opposite the Fantastic Four in 1966 and who is a regular foe of Black Panther.