Holmes and Dr Watson investigate the legend of a supernatural hound, a beast that may be stalking a young heir on the fog-shrouded moorland that makes up his estate.br br Richard Greene - Sir Henry Baskervillebr Basil Rathbone - Holmesbr Wendy Barrie - Beryl Stapletonbr Nigel Bruce - Dr. Watsonbr Lionel Atwill - James Mortimer M.D.br John Carradine - Barrymanbr Barlowe Borland - Franklandbr Beryl Mercer - Mrs. Jennifer Mortimerbr Morton Lowry - John Stapletonbr Ralph Forbes - Sir Hugo Baskervillebr E.E. Clive - Cabbybr Eily Malyon - Mrs. Barrymanbr Lionel Pape - Coronerbr Nigel De Brulier - Convict (as Nigel de Brulier)br Mary Gordon - Mrs.