Series episode
Cast: (18 - show/hide all)
| Benedict Cumberbatch | ... | Sherlock Holmes |
| Martin Freeman | ... | Dr. John Watson |
| Una Stubbs | ... | Mrs. Hudson |
| Rupert Graves | ... | DI Lestrade |
| Mark Gatiss | ... | Mycroft Holmes |
| Andrew Scott | ... | Jim Moriarty |
| Russell Tovey | ... | Henry Knight |
| Amelia Bullmore | ... | Dr. Stapleton |
| Clive Mantle | ... | Dr. Frankland |
| Simon Paisley Day | ... | Major Barrymore |
| Sasha Behar | ... | Dr. Mortimer |
| Will Sharpe | ... | Corporal Lyons |
| Stephen Wight | ... | Fletcher |
| Gordon Kennedy | ... | Gary |
| Kevin Trainor | ... | Billy |
| Rosalind Knight | ... | Grace |
| Sam Jones | ... | Young Henry |
| Chipo Chung | ... | Presenter |
Crew:
| Paul McGuigan | ... | Direction |
| Mark Gatiss | ... | Script |