Series episode
Cast: (28 - show/hide all)
| Benedict Cumberbatch | ... | Sherlock Holmes |
| Martin Freeman | ... | Dr. John Watson |
| Mark Gatiss | ... | Mycroft Holmes |
| Una Stubbs | ... | Mrs. Hudson |
| Rupert Graves | ... | DI Lestrade |
| Louise Brealey | ... | Molly Hooper |
| Amanda Abbington | ... | Mary Watson |
| Andrew Scott | ... | Jim Moriarty |
| Sian Brooke | ... | Eurus Holmes |
| Art Malik | ... | Prison Governor |
| Timothy Carlton | ... | Mr. Holmes |
| Wanda Ventham | ... | Mrs. Holmes |
| Simon Kunz | ... | Sir Edwin |
| Richard Crehan | ... | Ben |
| Ralph Ineson | ... | Vince |
| Matt Young | ... | Young Police Officer |
| Tam Mutu | ... | Leonard |
| Clare Foster | ... | Velma |
| Brett Allen | ... | Special Unit Guard |
| Rhys Rusbatch | ... | Technician |
| Paul Weller | ... | The Viking |
| Tom Stoughton | ... | Young Sherlock |
| Aaron Richards | ... | Young Mycroft |
| Indica Watson | ... | Little Eurus |
| Honor Kneafsey | ... | Girl on Plane |
| Harry Tuffin | ... | Victor |
| Grant Crookes | ... | Police Officer |
| Stuart Jason Lee | ... | Armed Guard |
Crew:
| Benjamin Caron | ... | Direction |
| Mark Gatiss Steven Moffat | ... | Script |