Benedict Cumberbatch Sherlock Actor Martin Freeman Watson Actor Una Stubbs Mrs Hudson Actor Rupert Graves DI Lestrade Actor Mark Gatiss Mycroft Holmes Actor, Writer, Executive Producer Louise Brealey Molly Hooper Actor Andrew Scott Jim Moriarty Actor Amanda Abbington Mary Morstan Guest Star Yasmine Akram Janine Guest Star Alistair Petrie James Sholto Guest Star David Fynn Howard Shilcott Guest Star Lisa McAllister Anthea Guest Star Alice Lowe Tessa Guest Star Darren Brown himself Guest Star Lars Mikkelsen Charles Augustus Magnussen Guest Star Oliver Hansley David Guest Star Timothy Carlton Sherlock's father Guest Star Ed Birch Tom Guest Star Louis Moffat young Sherlock Guest Star Wanda Ventham Sherlock's mother Guest Star Steven Moffat Writer, Executive Producer Nick Hurran Director Steve Thompson Writer Jeremy Lovering Director Colm McCarthy Director Susie Liggat Producer Sue Vertue Producer Beryl Vertue Executive Producer