Series episode
Cast: (27 - show/hide all)
| Benedict Cumberbatch | ... | Sherlock Holmes |
| Martin Freeman | ... | Dr. John Watson |
| Rupert Graves | ... | DI Lestrade |
| Una Stubbs | ... | Mrs. Hudson |
| Louise Brealey | ... | Molly Hooper |
| Vinette Robinson | ... | Sgt Sally Donovan |
| Tanya Moodie | ... | Ella |
| Siobhan Hewlett | ... | Helen |
| William Scott-Masson | ... | Sir Jeffrey Patterson |
| Victoria Wicks | ... | Margaret Patterson |
| Sean Joseph Young | ... | Gary |
| James Duncan | ... | Jimmy |
| Ruth Everett | ... | Political Aide |
| Syrus Lowe | ... | Political Aide |
| Katy Maw | ... | Beth Davenport |
| Ben Rufus Green | ... | Reporter |
| Pradeep Jey | ... | Reporter |
| Imogen Slaughter | ... | Reporter |
| David Nellist | ... | Mike Stamford |
| Louise Breckon-Richards | ... | Jennifer Wilson |
| Jonathan Aris | ... | Anderson |
| Lisa McAllister | ... | Anthea |
| Stanley Townsend | ... | Angelo |
| Peter Brooke | ... | Taxi Passenger |
| Philip Davis | ... | Jeff |
| Alison Egan | ... | Jimmy's Mum |
| Mark Gatiss | ... | Mycroft |
Crew:
| Paul McGuigan | ... | Direction |
| Mark Gatiss Steven Moffat | ... | Script |