Episode Part 3 Adaptation: The Hound of the Baskervilles Episode: 3 Airdate: 17 October 1982 IMDb: Part 3 (link not verified) Canon basis: The Hound of the Baskervilles Previous: Part 2 Next: Part 4 Cast Tom Baker as Sherlock Holmes Terence Rigby as Dr. John H. Watson Morris Perry as Barrymore Gillian Martell as Mrs. Barrymore Nicholas Woodeson as Sir Henry Baskerville William Squire as Frankland Caroline John as Laura Lyons Will Knightley as Dr. James Mortimer Michael Goldie as Selden Kay Adshead as Beryl Stapleton Christopher Ravenscroft as Jack Stapleton