The wait is officially over! Guy Ritchie's highly anticipated Young Sherlock has finally arrived on Prime Video. The prequel series uncovers the infamous detective's origin story and stars Hero Fiennes Tiffin as 19-year-old Sherlock Holmes. The series kicks off at Oxford University, where a shocking campus murder changes his life forever.
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.
Here is your complete guide to Young Sherlock—including the full cast and how to watch every episode.
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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
Prime Video is dropping the entire first season in one fell swoop, so get your snacks ready and prepare to binge every episode.
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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
Fun fact: Hero's real-life uncle—Joseph Fiennes—plays his dad on the show.
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
Silas is Sherlock's adventurous, but often absent dad—introducing a new layer of complex family drama to the origin story.
Natascha McElhone as his mom, Cordelia
Cordelia is a warm-hearted mother who always shows love and support to her family.
The Oscar winner plays an arrogant Oxford professor who loves taking credit for everyone else's hard work.
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Zine Tseng as Princess Gulun Shou'an
Princess Gulun Shou'an is a fearless visiting scholar who has serious chemistry with Sherlock.
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.
This will particularly resonate with longtime fans of the character. For example, if you want to watch the Benedict Cumberbatch series, you have to hunt for it on platforms like Hulu or BritBox. Meanwhile, Jonny Lee Miller's Elementary lives on Paramount+ and the Enola Holmesmovies are strictly on Netflix. So, unlike trying to track down other Sherlock projects, this new series has one home: Prime Video.
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.
Related: ‘Sherlock Holmes’ Will Soon Return to Television (But With An Unexpected New Twist)
Watch the 'Young Sherlock' trailer
Next up: Robert Carlyle Breaks Down His ‘Deceptive’ Take on Sherlock Holmes in ‘Watson’ (Exclusive)
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