They're called Cybermen, and aye, they're dangerous. Very dangerous. They're stronger than men, and can control their minds. And they've wanted to take us and make them into more beings just like them to build an army, but the Doctor's always managed to stop them.

[And Jamie is sure he can if they got out...but that's the part he's not sure about.]

I don't know if they'll be able to get out of there or not, though.