I liked this one, but it felt to me like there was a glorious opportunity missed of making this into a two-parter. First part being the companions on their own, living their lives outside the TARDIS until the tail end, when their lives outside and inside the TARDIS collide like they do halfway in this episode. Then the second episode could have focused on demonstrating the villain's persona better, and making a less convoluted climax (which I don't even remember by now). But I will say, concept-wise its kinda brilliant, Doctor Who's Freddy Krueger, sorta. Its just too bad that, like the rest of Chib's era, its got great idea but never quite risky to go the extra mile to produce a more exciting result. Its... vanilla.