• ‘Sherlock’ Season 5, episode 1 expected air date, spoilers: When will ‘Sherlock’ return with new episodes?

‘Sherlock’ Season 5, episode 1 expected air date, spoilers: When will ‘Sherlock’ return with new episodes? (Photo : YouTube/BBC)

The most chilling enemy of Sherlock's career is coming in the second installment of the season. The promo for "Sherlock" Season 4, episode 2 shows what happens in the new episode titled "The Lying Detective."

Warning: This article contains spoilers from "Sherlock" Season 4 episodes. Read to know more.

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"Sherlock" Season 4, episode 2 promo trailer

Note: The promo video will be uploaded as soon as the network makes it available.

Update: The promos starts with a shot of Culverton Smith arriving with smile on his face as Sherlock says that he is "the most dangerous and the most despicable human being" that he has ever encountered.

"This monster must be ended," Sherlock says in the video.

"Sherlock" Season 4, episode 2 synopsis and spoilers

Sherlock is up against his most dangerous enemy named Culverton Smith, who is someone with a dark secret.

"In episode two of this new series, written by Steven Moffat, Sherlock faces perhaps the most chilling enemy of his long career: the powerful and seemingly unassailable Culverton Smith - a man with a very dark secret indeed.

Benedict Cumberbatch returns as Sherlock Holmes, with Martin Freeman as John Watson, Mark Gatiss as Mycroft, Rupert Graves as Inspector Lestrade, Una Stubbs as Mrs. Hudson, Amanda Abbington as Mary Watson, Louise Brealey as Molly Hooper and Toby Jones as Culverton Smith," reads the synopsis shared by Spoiler TV.

This article will be updated, stay tuned.

"Sherlock" Season 4, episode 2 airs Sunday, Jan. 8, 2017 on BBC One in the U.K. and PBS in the U.S.

Credit: YouTube/BBC