Sherlock fans rejoice, a second trailer dropped over the weekend for the much anticipated Christmas special along with when it will air.

It's been a while coming as we have had no Cumberbatch-as-Sherlock action since season three at the start of 2014. However, along with this special, entitled 'Sherlock: The Abominable Bride', a new season will return in 2016.

This special however, which will air on New Year's Day in the UK and US, will see Sherlock and his trustee sidekick John Watson pull a Doctor Who on it and travel back to 19th century London, along with some other familiar faces including Mary Morstan, Inspector Lestrade and Mrs. Hudson.

Check out the trailer below;