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A pensive Sherlock returns in new image.

BBC One has debuted the first official image (above) for Sherlock Series 4, featuring stars Benedict Cumberbatch and Martin Freeman as Sherlock and John Watson respectively both looking smart, yet thoughtful.

The fourth series, which was teased at San Diego Comic-Con with the words “Thatcher”, “Smith” and “Sherrinford”,  will also see the return of Una Stubbs, Louise Brealey, Rupert Graves, Amanda Abbington and Mark Gatiss. 

The recent teaser trailer showed the return of Andrew Scott as Moriarty – in what capacity though is being kept under wraps. Toby Jones also joins the cast as a villain.

Sherlock returns to BBC One on New Year’s Day 2017.

Check out the full image below: