James Spader's performance as the villainous Ultron in Joss Whedon's Avengers: Age of Ultron was brilliant, and although his character was CGI, I thought he did a great job in bringing him to life with his voice and mannerisms.
And now, thanks to this newly-released behind-the-scenes video, we get a glimpse of how he acted in his motion capture suit, and it turns out that he was good at acting as his co-stars had trouble focusing on doing what they were supposed to be doing because they wanted to watch Spader perform. This video features interviews with cast and crew working with Spader. It also talks about Scarlet Witch's inclusion in the film. Watch the video below: