New Look at Young Sherlock Shows the Future Detective's First Encounter With Moriarty

Hero Fiennes Tiffin discusses the 'Butch and Sundance' dynamic between Sherlock and Moriarty in the upcoming Prime Video series.

Published on Feb. 25, 2026

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The new streaming series 'Young Sherlock,' premiering March 4 on Prime Video, puts a new twist on the classic rivalry between legendary detective Sherlock Holmes and his supreme rival James Moriarty. In an exclusive clip debuted at IGN Fan Fest 2026, series star Hero Fiennes Tiffin, who plays Sherlock, discusses the character's relationship with Moriarty, working with director Guy Ritchie, and what kind of Sherlock video game he'd like to see.

Why it matters

The dynamic between Sherlock Holmes and his nemesis Moriarty is one of the most iconic rivalries in literature and on-screen adaptations. This new take on their early relationship in 'Young Sherlock' offers a fresh perspective on the characters and their evolution.

The details

In the exclusive clip, viewers get a first look at Sherlock and Moriarty's initial encounter, which series star Hero Fiennes Tiffin describes as having a 'Butch and Sundance' dynamic. Tiffin says the two characters 'learn so much from each other' and have 'slightly different approaches, but they still have loads of similarities.' The actor also discusses the chemistry he developed with co-star Dónal Finn, who plays Moriarty, through extensive rehearsals to capture the characters' synchronicity.

  • The new streaming series 'Young Sherlock' premieres on Prime Video on March 4, 2026.
  • The exclusive clip was debuted at IGN Fan Fest 2026.

The players

Hero Fiennes Tiffin

The actor who plays the young Sherlock Holmes in the new Prime Video series.

Dónal Finn

The actor who plays the young James Moriarty, Sherlock's future adversary, in the new Prime Video series.

Guy Ritchie

The director who previously helmed two Sherlock Holmes films starring Robert Downey Jr. and is now serving as an executive producer on 'Young Sherlock.'

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What they’re saying

“Sherlock always needs a counterpart. It is usually Watson. And in our story, having it be Moriarty, you realize they learn so much from each other. Enemies who used to be friends, that's just a fascinating thing to explore. So it is fun watching, knowing that this plane is going to crash and burn. They have slightly different approaches, but they still have loads of similarities and they make a great team. Butch and Sundance was a reference that our showrunner used a lot.”

— Hero Fiennes Tiffin (IGN)

“When I think about why people gravitate towards this character, I think it's because he is as close to being a supernatural character who isn't a supernatural character. He's as close to being beyond human in his capabilities. He's just skin and bone the rest of us, but just an exceptional intellectual person. He's close to being (a superhero), but he's not. And I think that's what makes him so alluring and intriguing.”

— Hero Fiennes Tiffin (IGN)

What’s next

The new streaming series 'Young Sherlock' premieres on Prime Video on March 4, 2026.

The takeaway

This new take on the iconic Sherlock Holmes and Moriarty rivalry promises to offer a fresh perspective on the characters' early relationship and dynamic, exploring their similarities and differences as they develop into the legendary adversaries they are destined to become.