One of the big questions we had when it was revealed James Spader was joining 'Avengers 2' as the villainous robot Ultron, was whether Spader would simply be providing the voice or if he would actually be performing on set in a motion-capture suit. Today, courtesy Spader himself, we have the answer.

While promoting his new NBC series 'The Blacklist,' Spader talked to the Inquirer Entertainment about preparing to shoot motion capture for 'Avengers 2.'

I have spoken to Joss Whedon about it. And yes, actually, just this weekend I went in for them to take very extensive photographs, head scans, body scans, and all kinds of things in preparation for figuring out how the hell I’m gonna fit in this Ultron character!

And, that sounds perfect. There's no sense in hiring an actor like James Spader just for his voice (though his voice is indeed perfect) and it look as though Whedon will film Spader very similarly to how they created Hulk from Mark Ruffalo in the first film.

We still don't know yet how Ultron will be created in 'Avengers 2' but, if the assumption that he's created by Tony Stark is correct, we'll see a lot of Robert Downey, Jr. going face-to-face with his former 'Less Than Zero' co-star Spader, which is a pretty cool thing.

'Avengers: Age of Ultron' begins filming this January for a May 1, 2015 release.