The expansive Sherlock Holmes franchise has just gotten bigger with the announcement of a brand-new prequel series entitled Young Sherlock. Making his debut in the novels and short stories of Sir Arthur Conan Doyle in the year 1887, the intrepid sleuth Sherlock Holmes uses his amazing logic and deduction skills to crack some of the toughest fictional cases of the 19th century. Generally accompanied by his companion Dr. John Watson, Holmes wasted no time in jumping off the page and onto the stage and screen as his reputation grew over the years.
https://screenrant.com/young-sherlock-confirmation-cast-updates/