'Sherlock' at Last Begins Filming Season 4

Filming has begun on the long-awaited fourth season of "Sherlock," which BBC One promises will contain "laughter, tears, shocks, surprises and extraordinary cases."

This morning's announcement was accompanied by a brief video of co-creator Mark Gatiss declaring, "We're back! The game is on."

Once again starring Benedict Cumberbatch and Martin Freeman, the three-episode season opens with Sherlock Holmes back on British soil and Dr. Watson and his wife Mary preparing for their biggest challenge ever: parenthood.

Cumberbatch said in a statement that he's “genuinely thrilled to be back filming Sherlock with all the cast and crew. I can't wait for everyone to see Season 4. But you will have to wait ...  though not for long ... And it will be worth it.”

The debut episode will be directed by Rachel Talalay ("Doctor Who," "The Flash").

"Sherlock" Season 4 will air on BBC One in the United Kingdom and PBS in the United States.

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