Haven't done one of these for an age.

Steven Moffat, showrunner for Doctor Who, never likes to leave an idea unexplored. Even if he's explored it elsewhere. His award winning Blink was based on a short story in the then-recent Doctor Who Annual, What I Did On My Christmas Holidays By Sally Sparrow. With added monsters. His Silence In The Library rested in part on his sensational Continuity Errors short story from Decalog 3. And The Eleventh Hour had much in common with another Annual short story, Corner Of The Eye, introducing the race of Floofs who live alongside humans, always out of sight, just as Prisoner Zero does with Amy.

Of course, just because he's used that idea twice, doesn't mean he can't use it a third time.

The BBC America trailer shows a lot from the upcoming Impossible Astronaut series opener than the UK trailers have. We know there's some kind of Grey Alien prescence in America, but what is it exactly?

How long have they been here? As long as there's been something in the corner of your eye, creaking in your house or voices through a wall.

So are these Floofs?

Or are they… Silents? And what exactly happens to humanity if, as prophesied, The Silents Will Fall…