Re: 7X12 Nightmare in Silver(Grading/Discussion)(SPOILERS)
I might have missed it since the episode wasn't interesting to me but is it explained how the Cybermen were able to upgrade to the super speedy type?
Basically, after thousands of years fighting humans (and their improving technology), they upgraded their technology. These Cybermen are much superior to those of old. That's basically it.
When on Romulus, Do as the Romulans