Mark Gatiss. Good monster-of-the-week fun! With lots of action, some surprisingly good FX, and Martha’s family. Who are a bit one-note. Particularly the mother, who takes a dislike to The Doctor long before she is given a reason to. Shame. Wasted what could have been an interesting character arc. (Imagine how much more powerful it would have been if she started out liking him, before the mysterious stranger warned her. It would have made her much more interesting, for a start.) 8/10