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 (2002 film) stars Richard Roxburgh as Sherlock Holmes and Ian Hart as Doctor Watson. Hart would play Watson again in the 2004 TV film "Sherlock Holmes and the Case of the Silk Stocking", also written by Cubitt. The hound was a mix of animatronics and computer generated images and was created by the same team, Crawley Creatures and Framestore, that provided the dinosaurs for "Walking with Dinosaurs" and "The Lost World". This version diverges from the novel in a few instances. The film is set in the time period the original tale was published as opposed to when it was originally set.