Well, that was interesting. Yes, it was the usual fun and games, lots of running down corridors, a Mysterious Menace, a quick K-9 reference and the rest.
But this was different. The scariest thing in this special wasn’t the menacing force, though that was quite nasty. No, the real scare came from the Doctor himself. Having reluctantly decided that he can’t intervene this time, can’t change the dreadful thing that’s going to happen, because it’s one of those Fixed Points in Time, like Pompeii, after a traditional Big Explosion, he changes his mind. He goes back and tries to change things, in full glorious Tenth Doctor saving the day mode. And why has he done this? He decides that as he really is the last of the Time Lords, the old rules don’t necessarily count. In fact
The Laws of Time are mine. And they will obey me!
Which leads to all kinds of trouble, of course. He’s challenged by Captain Adelaide Brooke, who he saved in defiance of that fixed point thingy:
No-one should have that much power
Is there nothing you can’t do?
Not any more!
Adelaide (nicely played by Lindsay Duncan) does what she has to do to ensure that the future doesn’t get too messed up, which makes the Doctor realise he’s gone too far (again). He sees what may be a vision or a projection of an Ood.
And back in the Tardis, the Cloister Bell is ringing. And that generally means something very, very bad is going to happen.
And all that fun was followed by a short teaser for the Christmas two-parter – now known to be called The End of Time. As expected, the Master is back, there seem to be some highly developed Ood around, and no doubt lots more…
 I’m omitting details as some people may not have seen it yet
 Doctor Who magazine may have inadvertently mentioned that