starring

Elizabeth Olsen as Rachel Simpson

Martin Freeman as John Watson

Benedict Cumberbatch as Sherlock Holmes

guest starring

Amanda Abbington as Mary Morstan

Tom Hiddleston as Bayley Redding

Lars Mikkelsen as Charles Augustus Magnussen

Una Stubbs as Mrs. Hudson

Mark Gatiss as Mycroft Holmes

with cameos by

Rupert Graves as Detective Inspector Greg Lestrade

Louise Brealey as Molly Hooper

Kaley Cuoco as Amanda