The new season will continue the adventures of consulting detective Sherlock Holmes (Benedict Cumberbatch) and his trusty friend, John Watson (Martin Freeman). The cast also includes Mark Gatiss, Andrew Scott, Una Stubbs, Rupert Graves, and Louise Brealey.
Season four will feature a new villain played by Toby Jones. The new season is set to premiere on the BBC and on PBS (in the U.S.) next year.
Check out the first look below:
What do you think? Are you a fan of Sherlock? Are you excited for season four?