Episode The Powers of Evil Adaptation: The Hound of the Baskervilles Episode: 1 Airdate: 27 May 1988 Canon basis: The Hound of the Baskervilles Next: Death on the Moor Cast Roger Rees as Sherlock Holmes Crawford Logan as Dr. John H. Watson Richard Tate as Barrymore Barbara Atkinson as Mrs. Barrymore Norman Bird as Sir Charles Baskerville Matt Zimmerman as Sir Henry Baskerville Norman Bird as Frankland Barbara Atkinson as Mrs. Hudson Moir Leslie as Laura Lyons Peter Craze as Dr. James Mortimer John Baddeley as Postmaster Caroline Gruber as Beryl Stapleton Jonathan Tafler as Jack Stapleton (cast list not finalised)