When it comes to creepy aliens, Weeping Angels must be some of the most spine-chilling adversaries the Doctor has ever encountered.
Said to be as old as the universe itself, they are winged humanoids that are seen to stand statue-still. Yet, when no other creature is looking at them, they can move surprisingly swiftly.
The Doctor once observed that they are “the only psychopaths in the universe to kill you nicely.” With just a touch they can dispatch any other being into the past. Then they feed on the time energy of what would have been the rest of their victim’s life.