The Hounds of Baskerville order to test his theory. He also points out Sherlock was wrong for once; he believed the drug was in Henry's sugar and put it in John's coffee. In the closing scenes, Mycroft oversees the release of Jim Moriarty (Andrew Scott) from a holding cell in which he has written Sherlock's name all over the walls. The story is based on Arthur Conan Doyle's novel "The Hound of the Baskervilles", and also contains plot devices and lines from other Doyle stories: In June 2011, it was announced that Russell Tovey would appear in "Sherlock" series two in its second episode.
The Hound of the Baskervilles (1939 film) of the Baskervilles, who hopes to claim their vast fortune himself after removing all other members of the bloodline. Stapleton kept a huge, half-starved, vicious dog (played by a Great Dane) trained to attack individual members of the Baskervilles after prolonged exposure to their scent. However, when the hound is finally sent to kill Sir Henry Baskerville, Holmes and Watson arrive to save him just in time. They kill the hound. Stapleton then traps Holmes down in the hound's underground kennel, and sends Watson into the moor to meet Holmes. Holmes cuts his way out of the kennel and returns