Guest Stars Rupert Graves as DI Lestrade Una Stubbs as Mrs. Hudson Louise Brealey as Molly Hooper Mark Gatiss as Mycroft Holmes Andrew Scott as Jim Moriarty Amanda Abbington as Mary Morstan Sian Brooke as Eurus Holmes Simon Kunz as Sir Edwin Wanda Ventham as Mrs Holmes Timothy Carlton as Mr. Holmes Ralph Ineson as Vince Indica Watson as Little Eurus Aaron Richards as Young Mycroft Paul Weller as The Viking Harry Tuffin as Victor Trevor Brett Allen as Special Unit Guard Art Malik as Prison Governor Clare Foster as Velma Tam Mutu as Leonard Rhys Rusbatch as Technician Tom Stoughton as Young Sherlock Richard Crehan as Ben Honor Kneafsey as Girl on Plane Matt Young as Young Police Officer
