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In production terms, it was the first episode of Doctor Who to be filmed primarily in narrative order since the practice was abandoned around the time Jon Pertwee began portraying the Third Doctor. It was the only story in which the antagonist was never even partially glimpsed, leaving the threat to be realised by the actors and the sound editors. It was also the second episode of 2008 to guest star the child of an actor who had played the Doctor: David Troughton as Professor Hobbes, his father playing the Second Doctor.