Dr. Watson and the Darkwater Hall Mystery (1974)
| Release Date: | 1974, December 27 |
| Directors: | James Cellan Jones |
| Countries: | United Kingdom |
| Production: | BBC |
| Cast: | Terence Bayler, Derek Deadman, Christopher Cazenove, Edward Fox, Elaine Taylor, John Westbrook, Jeremy Clyde, Ande Cunningham, Anthony Langdon, Marguerite Young, Carmen Gómez |