Season 1 BBC One , 2010 Watch now Dr John Watson returns from service in Afghanistan and finds himself drawn inexorably into the world of the brilliant but baffling 'consulting detective', Sherlock Holmes. Season 2 BBC One , 2012 Watch now Sherlock and John Watson return in a contemporary take on Conan Doyle's iconic adventures. Season 3 BBC One , 2014 Watch now Sherlock returns - but will things ever be the same again? Season 4 BBC One , 2016 - 2017 Watch now Sherlock and Dr John Watson return in Steven Moffat and Mark Gatiss's contemporary take on Conan Doyle's most iconic adventures.
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