 Mark Gatiss wrote "The Hounds of Baskerville", which investigates the strange activities at a military base. Aware that The Hound of the Baskervilles, first published in 1902, was one of the most famous of Conan Doyle's original stories, Gatiss felt a greater responsibility to include familiar elements of the story than he does when adapting the lesser-known stories. Russell Tovey appeared as Henry Knight, a man whose father was ripped apart by a gigantic hound on Dartmoor twenty years earlier. Directed by McGuigan, the episode was first broadcast on 8 January 2012.
