Last month, Dawn of the Planet of the Apes star Andy Serkis confirmed that he'll have a role in Avengers: Age of Ultron, while also serving as a performance capture consultant, working alongside Mark Ruffalo. Since Andy Serkis never specifically said what character he is playing in Avengers: Age of Ultron, some speculated that he might be playing Thanos in the Marvel Phase Two sequel. However, the actor denied playing the villain in a recent interview, but went on to say how thrilled he was that director Joss Whedon asked him to come on board.
"Um...I'd have to deny that character at this point. But I am playing a character. I was really thrilled that Joss Whedon asked me to be involved. It's fantastic. I've had a ball working with them, both as performance capture consultant through the Imaginarium, but also being asked to be in it. But I can't say anything more!"
"The difference for Mark this time around is that the Imaginarium, which is our performance-capture studio in London that's providing all the performance capture for the Avengers movie, is providing education. Previously, he would've walked onto a set and you've got Thor and all the other characters in their costumes looking magnificent, and then you'd have Mark in a grey motion-capture suit playing this enormous character, so it's about giving the actor the right atmosphere and credibility for the performance, which we did in a number of ways. We had to educate the director that the actor owns the role, and what you get on the set is what you should be aiming to put into your cut as the final performance-with the rendering coming later on.
Also, we worked with Mark in really grounding him and playing with the digital avatar before going on set so he could see himself as the Hulk before going onscreen, and we put weights and inhibitors on him to give him the sense that his arms were these big, giant wrecking balls, and so that his biceps wouldn't intersect with his body. We equipped him. We also gave him a sound system and pitch-modulated his voice so you could hear the enormous Hulk roar coming out of these speakers, so the crew would go, 'Jesus! That's Hulk on set!' It gives Mark the sense of feeling better, and if he feels better, then he'll be more comfortable in the performance."