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buy diamox This story saw the first appearance of Captain Jack and was the first written by Steven Moffat (excluding the 1998 Comic Relief spoof). It has been a trope since the series started that part of its aim is to scare, and if there were any doubts that its 21st century incarnation might not follow in this vein, this two-parter would have put them firmly to rest. Cannily using a night-time setting to add a layer of eeriness, the simple image of a boy in a gas mask asking a repeated question leads to a generally scary couple of episodes. It is another example of how in the right hands the seemingly mundane can be transformed by Doctor Who into something unsettling, and by the device of making him speak through a variety of media (including an external phone on the Tardis police box) it gives him a genuinely unsettling ability.