Sherlock - Series 1 trailer

The world's favourite detective has emerged from the fog in BBC One's Sherlock, starring Benedict Cumberbatch as Sherlock and Martin Freeman as Watson.

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Watson, a doctor, soldier and war hero, is fresh from military service in Afghanistan. A chance encounter brings him into the world of Sherlock Holmes, a loner, detective and genius. The two men couldn't be more different, but Sherlock's inspired leaps of intellect, coupled with John's pragmatism, soon forge an unbreakable alliance.