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‘Sherlock’ Season 4 Goes Dark at Comic-Con

Sherlock star Benedict Cumberbatch joined Executive Producers Steven Moffat, Mark Gattis, Sue Vertue, and actress Amanda Abbington (Mary Morstan) on the Hall H stage at Comic-Con on Sunday to tease the beloved BBC show’s anticipated Season 4 return.

Fans hoping for big reveals may have been disappointed by the mostly tight-lipped proceedings, but we were treated to a new trailer for the upcoming season which promises to be the darkest yet.

Sherlock Season 4 is set to premiere in 2017 with three 90-minute episodes. Toby Jones, seen in the trailer, will join the cast.

"It’s the darkest that Steven and Mark have written," Abbington told the crowd. And Cumberbatch called the season "a genuine emotional roller coaster."

Moffat, who has previously hinted that the next season could be Sherlock's last, said, "We have no idea whether it will be the last one or not." But Gatiss was more hopeful. "We hope to carry on. Everyone loves the show," he said.

The only real tease, apart from the video, were three words that creators gave fans as hints for next season: Thatcher, Smith, and Sherrinford. Sherrinford likely refers to the third Holmes sibling referenced by Mycroft in the last episode of the third season.

A final highlight came as Gattis slyly teased that last year's time-jumpy Christmas Special, set in the Victorian era, could actually be the REAL Sherlock. He pointed out that there's a line in which Sherlock refers to the events of the contemporary show as "my vision of the future," which could mean the entire series takes place in his mind.

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Brian Linder

Brian Linder has been on the fan-media scene since dial-up. Arriving at Fandom by way of IGN, Brian was a founding editor at popular Star Wars fansite He is co-creator of the groundbreaking movie site, FilmForce, which was absorbed by IGN in 2006. Today, he's Senior Editor of entertainment content at Fandom. He enjoys space sagas and superheroes.

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