And tonight's episode on the BBC was a real stunner. Tense, clever, neat... It was nigh on perfect as mild SF/horror TV. The baddies were properly menacing, in a kind of inverted Bugblatter Beast of Traal-way: harmless when you look at them, nasty when you don't. And according to the currently-playing behind-the-scenes show, they were done with guys in makeup - even though they never move on-screen. Which would be how they managed the menacing not-just-a-mockup feel.