For people who are wondering why Benedict Cumberbatch is in almost every role, watching "Sherlock" would help give answers. His role as the titular character has gained so much praise from fans and critics alike.

BBC's "Sherlock" is a modern retelling of the story of Sherlock Holmes. The characters, interactions, and storylines are one of the most faithful to the books by Sir Arthur Conan Doyle.

The story revolves around Sherlock Holmes played by Benedict Cumberbatch, along with Doctor John Watson played by Martin Freeman. Staying true to the chemistry between Watson and Holmes, Cumberbatch and Freeman has a level of 'bromance' between them.

As with most British TV series, "Sherlock" is not released annually, but a new season is out every other year. As long-awaited season 4 of "Sherlock" is to premiere this January 1, 2017, fans have been itching to get a glimpse of what is to come.

The new series would feature a new addition to the dynamic between Watson and Holmes. John and Mary Watson now have a baby, adding a baby to the burden of taking care of Holmes. With Holmes recklessness, and the baby's vulnerability, Watson's patience would be put to the test. However, their relationship would still be the same according to an article in Radio Times.

Excluding the addition of the baby, this season is to be darker than the previous seasons. As season 3 was building up to a major event, this season is supposed to be the pay-off that fans are looking for.

According to Cumberbatch, the story has been strung and threaded from the beginning. According to Digital Spy, Cumberbatch stated that they are "remarkably long-term in their planning". The pay-offs this season are all connected to everything at the beginning of the story. This makes season 4 more serious and has more weight compared to the previous seasons.