Board Thread:The Reference Desk/@comment-26975268-20130223231514/@comment-26975268-20130223235822

I kind of remember that too, but explain this, then:

DOCTOR: It's happening again. ROSE: What do you mean? DOCTOR: I've seem them before. ROSE: What are they? DOCTOR: Cybermen.

Quickly skipping through the episode, it seems this is the first bit of dialogue between the Doctor and Rose about Cybermen. I'll re-watch the episode fully either today or tomorrow and get back to you.