Check this out: http://www.youtube.com/watch?v=-q2KzOnZxcM
Man, this is amazing! I love how J5 is on the SC2 set doing this ad. Of course his voice is way off, but who cares? This is so awesome!
My guess is that they had Rob Mills (who operated the head and did the voice on set for SC2) to do the voice of Johnny, instead of having Tim Blaney do it.