Series episode
Cast: (28 - show/hide all)
| Benedict Cumberbatch | ... | Sherlock Holmes |
| Martin Freeman | ... | Dr. John Watson |
| Rupert Graves | ... | DI Lestrade |
| Una Stubbs | ... | Mrs. Hudson |
| Zoe Telford | ... | Sarah |
| Louise Brealey | ... | Molly Hooper |
| Andrew Scott | ... | Jim Moriarty |
| Vinette Robinson | ... | Sgt Sally Donovan |
| Matthew Needham | ... | Bezza |
| Kemal Sylvester | ... | Tube Guard |
| San Shella | ... | Andrew West |
| Deborah Moore | ... | Crying Woman |
| Lauren Crace | ... | Lucy |
| Nicholas Gadd | ... | Scared Man |
| Caroline Trowbridge | ... | Mrs Monkford |
| Paul Albertson | ... | Mr Ewart |
| Rita Davies | ... | Blind Lady |
| Di Botcher | ... | Connie Prince |
| John Sessions | ... | Kenny Prince |
| Stefano Braschi | ... | Raoul |
| Jeany Spark | ... | Homeless Girl |
| Alison Lintott | ... | Julie |
| Haydn Gwynne | ... | Miss Wenceslas |
| Doug Allen | ... | Joe |
| John Lebar | ... | Golem |
| Lynn Farleigh | ... | Professor Cairns |
| Peter Davison | ... | Planetarium Voiceover (voice) |
| Mark Gatiss | ... | Mycroft Holmes |
Crew:
| Paul McGuigan | ... | Direction |
| Mark Gatiss | ... | Script |