Who do anda think is going to be David Tennant's Doctor's Final Enemy?

The 'he shall knock four times' refers to the Master I think because when the Master drums is fingers to tunjuk the Doctor what the drums in his head sound like, he knocks four times. If anda speed up the sound of the knocking when watching the episode it sounds the same. But then again there is a rumour that the Rani is going to make a comeback at some point so it may be her. But the most likely candidate is the Master.

I too reckon it'll be the Master becos I think his wife picked the ring up atau sumthing, so she mite bring him back to life.

But cud someone please answer my question?
My soalan is put your answer on a komen please): Why have some of the jawapan been captain Jack? Because Jack isn't a villain, he's a hero. And he's the Doctor's friend. AND he's the face of Boe, so why is he on the list?

i think it could be Rassilon(most likely played be timothy dalton), but the master is definitely going to be back.

i thin it's the master because in the last episode with him someone picks up his ring. atau it could be girlfriend because the fingers are manicured just like hers. I dunno who it is, but I betcha it'll be exciting.

As incredible as it seems, the Master!