Series episode
Cast: (32 - show/hide all)
| Benedict Cumberbatch | ... | Sherlock Holmes |
| Martin Freeman | ... | Dr. John Watson |
| Una Stubbs | ... | Mrs. Hudson |
| Rupert Graves | ... | DI Lestrade |
| Mark Gatiss | ... | Mycroft Holmes |
| Louise Brealey | ... | Molly Hooper |
| Amanda Abbington | ... | Mary Watson |
| Lindsay Duncan | ... | Lady Smallwood |
| Simon Kunz | ... | Sir Edwin |
| Sacha Dhawan | ... | Ajay |
| Marcia Warren | ... | Vivian |
| Eleanor Matsuura | ... | DI Hopkins |
| Paul Chequer | ... | DI Dimmock |
| Gabrielle Glaister | ... | Ambassador |
| Harry Gostelow | ... | Husband |
| Charles Edwards | ... | David Welsborough |
| Amanda Root | ... | Emma Welsborough |
| Rob Callender | ... | Charlie Welsborough |
| Sian Brooke | ... | Elizabeth |
| Richard Syms | ... | Vicar |
| Neal Barry | ... | Ray Kingsley |
| Edward Judge | ... | Craig |
| Andrew Bone | ... | Jack Sandeford |
| Albert Magashi | ... | Karim |
| Tanya Moodie | ... | Ella |
| Daniel Hoffmann-Gill | ... | Gold Teeth Man |
| James Holmes | ... | Plane Passenger |
| Eiry Thomas | ... | Stewardess |
| Aleksandar Mikic | ... | Guard |
| David Colbourn | ... | Male Client |
| Hattie Ladbury | ... | Female Client |
| Francesco Rochira | ... | Gunman |
Crew:
| Rachel Talalay | ... | Direction |
| Mark Gatiss | ... | Script |