This episode of Dr Who is again showing that this series is getting better, but taking its sweet time to get there. The episode is very reminiscent of the series 2 episodes "The Impossible Planet/The Satan Pit". The episode was fast paced and very scary in places, I can see why the BBC didn't want to put it on before 7 o clock. Like most of the episodes of Dr Who this series, and the last two for that matter, there was a lot of running around, but the episode was clever and surprisingly emotional as well. It also managed to overcome the 'episode 7 filler' syndrome, as these episodes tend to be the blandest ones in the whole series (the long game, the idiots lantern). All in all, a very well made, exciting and tense episode.