New Who or old Who.
Although the weeping angels are high up on the list, they take a second place to one monster that I find to be terrifying and we know NOTHING about.
Whatever that thing was on the planet of midnight. That is the scariest. That thing is strong, brilliant, and completely unknown. It's to us what the doctor is to the bad guys. Unknowable power and completely on the other side as us.
im gonna have to say for me, its the waters on mars guys. i mean, they got me scared to drink water, and i was so reluctant to do it, my mother had to force me. (although i was 10 at the time). my list of top 5,
1. Waters on Mars
2. Weeping Angels (of course)
4. The Beast from the god complex? it's always scared me that something could take your biggest fears and make them real
5. and probably the Cybermen
I think it's either the virus from Waters of Mars or the thing from The Satan Pit. those are both very under-appreciated scary things.
ahh! The Satan Pit is one of my favourites!!
Oh I didn't think of the Satan pit! I loved that episode, I might have to agree with you on that one.
Some people have been talking about Midnight, and I definitely agree that it is the most sinister of the enemies.
Not sure which is the scariest of the enemies though...
Weeping Angels are up there.
As is the Doctor when he slips into his anger.