Doctor Who is famous for it's monsters, the phrase "hide behind the couch" has become sin-ominous with the show, which some might find funny in retrospect as many of the monsters are from an era where the best they had to scare you with were an upended trash can a plunger and an egg beater. Still they found a way to make those things to the now famous Dalek in the 1960's, and the Cybermen soon after. Those two stand out as the major monsters of the show, they both have been around for near on 50 years now, and they are still scary. How did that happen?
Things that last the test of time have something extra to them that help them live, something outside what they are that they tap into to refresh themselves for new generations that allows them to become iconic. For the Daleks that's how they act, they are essentially a fascists, space Nazis squids in a tin can with a creepy voice obsessed with "EXTERMINATE"ing those deemed less than them. In so being they represented the enemy of the past when they were introduced, one that many of those watching still had living memory of, and they have stayed in our zeitgeist because we've never had a better villain in the 20th century. 
from yourself, that was the national panic at that time, the red scare made sliver. All were the same, all were emotionless and sure that their way of living was better, and they were coming for you to make you agree.
Most recently the show has stumbled on a new villain, a new icon for a new show in a new age. The Weeping Angels, statutes that would come alive when you were not looking and either snap your neck or displace you in time to then feast on what would have been in your life. They are a wonderful mix of the mundane and creepy, grey angels in a pose as if they are weeping, but look away just for a second and they will be right on top of you with sharpened teeth and a hungry glare. They don't talk, they just take you away. The fear that they represent is that of Terrorism. That one day you could be walking about, not playing attention and BAM, your life could be taken away. The idea that we constantly need to keep an eye out for them and an eye on them is also a telling part of modern cation or paranoia depending where you fall.
I would love to write a Weeping Angels episode, I have one in my head right now. So far the Doctor has advised men on how to avoid them, has cast them into a void, and has survived them, but he has yet to stop them in a way in which he wins his way. He has yet to understand them, to fight them in the way they need to be fought, and he has yet to truly beat them. I would love to give the Doctor that victory, a victory where he faces our fear and once again does what he was made for, shows us that its OK to be afraid and OK to live with that fear because that fear isn't so big that it can't be beaten with the right set of wits about you.
Stay Tuned and Merry Christmas.
