No love for the Master? Come on! He's the yang to the Doc's yin, etc.

The Ood. When controlled by Satan.

Hey, who turned out the lights?

I know its the obvious choice but those weeping angels seriously scare the poop out of me. A close second is the “Are you my mummy?” boy in gas mask from Empty Child. Am I the only one who don't find the Daleks particularly scary? I think the Cybermen are scarier, personally.