Human Nature, part 1 of 2. Apparently a great episode, one of (if not the) best episodes this season. Based off of a longtime fan favorite Doctor Who novel, making it into an episode effectively makes it official canon. The person that originally wrote the novel also wrote the episode, so it is all good. Also, evil scarecrow monsters ftw.
Rumors are apparently spinning that Marth won't be the Doctor's companion for much longer. I can see why that is: she has slowly morphed into Dark Chocolate Rose with a less entertaining family.
Anyway, start downloading. I will be here later tonight for the post ep report!