'Sherlock' is all set to capture again its avid viewers as it unfolds its fourth season next year. Fans are greatly excited as Benedict Cumberbatch is returning as Sherlock. Creators of the show added that this season, Sherlock's adventure is getting more intense and difficult, here's why.

'Sherlock' Season 4 News Update: Benedict Cumberbatch Returns As Sherlock, Here's What We Should Expect From Him

According to some sources, the first three seasons of the series focused on the brilliance of Sherlock to solve difficult situations professionally. But this time, the series get more critical as the lead character faces more intense, thrilling and difficult circumstance that will question his brilliance.

Furthermore, it was reiterated in the series' promo that the show will go darker compare to the previous installments. The creators allegedly gave everything for this season as it was reported to be the final season.

In current reports, it was told that Sherlock would get to face a villain by the presence of Toby Jones' Culverton Smith. He is ready to be a huge bump and a threat in the lead star's exploration.

Toby Jones' Culverton Smith Appears As New Villain In The Show, Character To Help Jim Moriarty Defeat Lead Character Sherlock

Recent news admitted that Smith would work hand in hand with Jim Moriarty to finally defeat the character of Sherlock. Moriarty disappeared in the show but allegedly returning for this season. Fans already gave speculations as to why the two would work together to be able to avenge from Sherlock.

It was revealed that Smith is planning to kill high profile citizens and Sherlock would not let it happen. Thus, Smith would do everything just to let the lead character get out of his plans and ways. Would he be successful?

'Sherlock' Season 4 is all set to be aired on January 1, 2017.