Today, Prime Video announced new series regulars joining the cast of Season Two of Young Sherlock and released a start-of-production video featuring Guy Ritchie, Hero Fiennes Tiffin, and Dónal Finn. Season Two is currently in production and all eight episodes of Season One are available exclusively on Prime Video in more than 240 countries and territories worldwide. Through its first 28 days of release, Young Sherlock reached 45 million viewers and ranks among the top 10 Prime Original Seasons all-time. The Season One trailer reached 223 million views in its first seven days, breaking a record as the most-watched series trailer ever in that time frame for Prime Video. Motive Pictures leads physical production for Young Sherlock.