But don't expect to see a polished detective like the versions played by Benedict Cumberbatch orRobert Downey Jr. in previous Holmes adaptations. Young Sherlock is just a teen investigating his very first case—for better or for worse! So whether you're a longtime fan of the Arthur Conan Doyle canon or are just looking for your next massive weekend binge, we’ve got you covered.
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When does Season 1 of 'Young Sherlock' premiere?
Season 1 of Young Sherlock officially premieres on Wednesday, March 4, 2026. (That's today!)
Joseph Fiennes (Sherlock's dad), Hero Fiennes Tiffin (Sherlock) and Dónal Finn (James Moriarty) attend the Young Sherlock premiere in London.Photo by Simon Ackerman on Getty Images
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Who’s in the cast of 'Young Sherlock'?
The Young Sherlock cast is a fantastic mix of rising Gen Z talent and beloved veteran actors. Here they are:
Prior to Young Sherlock, Hero Fiennes Tiffin was best known for his role in the After movies.Photo by Manuel Velasquez on Getty Images
Dónal Finn as James Moriarty
In this era, Sherlock and James are actually best friends! You may recognize Finn from his role as Mat Cauthon in Prime Video’s The Wheel of Time.
Max Irons as Mycroft
Mycroft is Sherlock's older brother. In classic Holmes lore, Mycroft is actually smarter than Sherlock, but he's often too lazy to do his own legwork. In this series, he's the reason Sherlock is at Oxford in the first place, which sets up a tense sibling rivalry.
From left to right: Max Irons, Hero Fiennes Tiffin, Zine Tseng, Dónal Finn, Joseph Fiennes and Guy RitchiePhoto by Ian West - PA Images on Getty Images
Natascha McElhone as his mom, Cordelia
Cordelia is a warm-hearted mother who always shows love and support to her family.
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Zine Tseng as Princess Gulun Shou'an
Young Sherlock is streaming exclusively on Amazon Prime Video. While you'll need a Prime subscription to tune in, the good news is that you won't have to hop between different platforms to binge the entire season.
How many episodes are there in Season 1 of 'Young Sherlock'?
There are eight episodes in Season 1 of Young Sherlock. If you hate waiting week-to-week for cliffhangers to be resolved, you are in luck—Prime Video is dropping all eight episodes at the exact same time. To set the gritty, action-heavy tone, executive producer Ritchie personally directed the first two episodes.
Watch the 'Young Sherlock' trailer
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