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Martin Freeman, Benedict Cumberbatch and Amanda Abbington
Sherlock is one of the most watched and acclaimed shows on TV.
And according to reports this probably will be the last series.
Fans are waiting with bated breath for 1st January when the new episode will be premiered.
Watson is a father, Sherlock, an annoyed uncle , and a new villain makes his debut in form of Culverton Smith played by Toby Jones.
Executive producer Steven Moffat thinks that the new villain is the USP of season 4, "He’s completely different. It’s a completely different. He’s the darkest villain we’ve had. There was always something charming and engaging about Moriarty. There was something fascinating and actually amoral, rather than immoral, about Charles Augustus Magnussen. This guy is the purest evil. Sherlock is actually appalled by him. He’s the most evil villain we’ve had. I don’t think that when you see it, you will disagree. He’s horrific."