Watch the New Teaser for 'Sherlock' - Creative Planet Network

Watch the New Teaser for 'Sherlock'

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The much-anticipated fourth season of Sherlock will premiere on PBS on January 1st, and the two teasers released so far promise a darker side to the beloved characters.

While they don't reveal too much, the teasers do show off Toby Jones playing a new villain, the normally prim Mrs. Hudson giving Mycroft Holmes a piece of her mind, and Benedict Cumberbatch's high-functioning sociopath saying the most unlikely of words: "I love you."

Watch them both below.