Now that we've seen the extended trailer, we know that Avengers: Age of Ultron will be bigger than its predecessor and, seemingly, much more cinematic.  We've also got a good sense of what James Spader's Ultron will look and act like (which was sort of a mystery to people like me who haven't read many Marvel comics).  Andy Serkis, who we all know at this point as the reigning celebrity of motion capture (as well as narrator of the new Star Wars trailer), worked a lot on the character as well and helped shape his movements.  He recently discussed that process, along with what it takes to make Mark Ruffalo look like the Hulk.

Hit the jump to check out Serkis' comments on the mo-cap in Avengers: Age of Ultron.  The film opens in 3D on May 1, 2015 and also stars Robert Downey Jr.Chris EvansScarlett JohanssonChris Hemsworth, Jeremy RennerElizabeth OlsenAaron Taylor-JohnsonPaul BettanyDon CheadleAndy Serkis and Samuel L. Jackson.

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Serkis told Empire that a lot of work went into calibrating Ultron's movements to be the right blend of man and machine:

 “On the development of Ultron before James Spader came on board. In terms of movement styles: was he gonna be human-like? Was he going to 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...”

Serkis also mentions that in order to turn Mark Ruffalo into the Hulk, they give him weights to carry that transform his physique into something more lumbering:

“We gave Mark weights, we had voice projections so he could do his Hulk roar.  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.”

Be sure to check back soon for Steve's interview with Serkis that covers Avengers: Age of Ultron, The Jungle Book, and more.

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