And, abruptly back on topic with a belated review of the episode!
I thought this episode was very good indeed. I gave it 8/10 as there were little parts of the episode I didn't really like (such as a huge great firey monstrosity being doused by a water pistol, kind of reminded me of Pokemon) but otherwise it had all the ingredients of a good solid Doctor Who episode. A moral dilemma (hurrah, the philosophy has returned) which I thought was well brought out by Donna/Tate, and now hopefully Donna knows that the Doctor always knows best

as well as a good bit of action and mayhem which is always good. However I thought the escape pod was a bit far-fetched (yeah I know, creatures made up of molten lava are much more plausible) and at some points the plot was bit difficult to follow (grasping exactly how the Sooth-Sayers as well as the Sybbaline (Jesus just call them witches next time for gods sake its much easier to spell) connected in with the Pyroviles was a little hard to grasp, I thought).
Any guesses to the 'arc' this season then? Apart from of course the constant Rose references, we know that the arc this season is supposed to be something other than a single word or character (thank god they varied it) but a lot of interlinking items, from the past three series as well, that will all connect together in the end. We have already had the news of two planets lost and have breezed over the reasons for their destruction (most unlike the Doctor). Any thoughts? Or is that going too far off topic?