'Sherlock' video: 'His Final Vow' promo turns Holmes' stomach

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The "Sherlock" Season 3 finale, "His Final Vow," introduces fans to a new enemy, Charles Augustus Magnussen ( Lars Mikkelsen). As the promo video for the episode shows, Magnussen may be Holmes' least favorite person in the world.

"I've dealt with murderers, psychopaths -- none of them could turn my stomach like Charles Augustus Magnussen."

Not only does Magnussen make Sherlock ( Benedict Cumberbatch) nauseous, but the blackmailer also poses additional threats to Holmes. For one thing, Mycroft ( Mark Gatiss) seems to be on the bad guy's side -- does Magnussen have something on Sherlock's brother? There's also the implied threat against Watson ( Martin Freeman) and/or Mary ( Amanda Abbington).

Could the upcoming Watson baby be in danger? Considering the title of the episode -- foreshadowed in Sherlock's final speech at the wedding -- Holmes may find himself defending Watson with everything he has.

"His Final Vow" airs Sunday, Jan. 12 on the BBC and Sunday, Feb. 2 on PBS.

Photo/Video credit: BBC