As a huge fan of Sherlock Holmes, I’m really excited about the new Prime Video series, ‘Young Sherlock’! It’s cool to see Guy Ritchie, who’s done some fantastic work with action and storytelling, tackling the early years of the famous detective. It’s a fresh take on the character and a look at how he might have become the brilliant mind we all know.
Hero Fiennes Tiffin stars as a young Sherlock Holmes in this series, solving his very first mystery – a complex conspiracy that spans the world.
The film also stars Dónal Finn, Max Irons, Zine Tseng, Natascha McElhone, and Colin Firth. Notably, Joseph Fiennes, who is related to Fiennes Tiffin in real life, will portray Sherlock’s father, Silas.
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Read on for everything you need to know about the cast of Young Sherlock.
Young Sherlock cast guide: Full list of actors
Meet the stars of Young Sherlock! Below, you’ll find details about the main characters and the actors who play them, including where you might recognize them from.
- Hero Fiennes Tiffin as Sherlock Holmes
- Dónal Finn as James Moriarty
- Max Irons as Mycroft Holmes
- Zine Tseng as Princess Gulun Shou’an
- Joseph Fiennes as Silas Holmes
- Natascha McElhone as Cordelia Holmes
- Colin Firth as Sir Bucephalus Hodge
Hero Fiennes Tiffin plays Sherlock Holmes
Sherlock Holmes is a bright young man trying to figure out his life. He possesses incredible intelligence and skills in deduction, and he’s destined to become the world-famous detective we all know.
You might recognize Hero Fiennes Tiffin from movies like Harry Potter and the Half-Blood Prince, The Woman King, and The Ministry of Ungentlemanly Warfare, or the After film series. He’s also appeared in the TV shows Safe and Cleaning Up. Interestingly, he’s related to actors Ralph and Joseph Fiennes – he’s their nephew.
Dónal Finn plays James Moriarty
James Moriarty is a brilliant Oxford student who is Sherlock Holmes’s intellectual equal. They initially form a friendship, but it’s foreshadowed that they will eventually become bitter enemies.
I’ve been seeing Dónal Finn pop up everywhere lately, and I was trying to figure out where I knew his face from! Turns out, he’s been in a bunch of cool projects. I remember him in How to Build a Girl and Fantastic Beasts: The Secrets of Dumbledore, and he’s also had roles in series like The Witcher, SAS Rogue Heroes, and The Wheel of Time. He’s definitely one to watch!
Max Irons plays Mycroft Holmes
Who is Mycroft Holmes? Mycroft is Sherlock’s older brother, who works for the Foreign Office.
You might recognize Max Irons from movies like Dorian Gray, The Host, The Riot Club, Woman in Gold, The Wife, and Terminal. He’s also appeared in TV series including The White Queen, The Little Drummer Girl, Condor, and Miss Austen.
Zine Tseng plays Princess Gulun Shou’an
Who is Princess Gulun Shou’an? Gulun is a Chinese Princess who is attending Oxford University.
Where have I seen Zine Tseng? Tseng previously had a key role in the Netflix series 3 Body Problem.
Joseph Fiennes plays Silas Holmes
Who is Silas Holmes? Silas is Sherlock and Mycroft’s father, a scientist and explorer.
I always recognize Joseph Fiennes – he’s been in so many great things! I first remember him from films like Elizabeth and Shakespeare in Love, but he’s also been fantastic in Enemy at the Gates and even Hercules. On TV, I’ve enjoyed him in series like Flashforward, Camelot, American Horror Story, and The Handmaid’s Tale – and more recently, Prisoner 951. I’m really excited to hear he’s bringing his stage performance as Gareth Southgate to the BBC’s Dear England – I’m definitely going to watch that!
Natascha McElhone plays Cordelia Holmes
Cordelia Holmes is the mother of Sherlock and Mycroft. She has faced mental health challenges and is currently receiving care in an asylum.
You might recognize Natascha McElhone from movies like Mrs Dalloway, The Truman Show, Killing Me Softly, and The Other Boleyn Girl. She’s also appeared in TV shows including Californication, Designated Survivor, The First, The Crown, Halo, and Hotel Portofino.
Colin Firth plays Sir Bucephalus Hodge
Who is Sir Bucephalus Hodge? Bucephalus is a senior figure at Oxford University.
You probably recognize Colin Firth from a lot of popular movies and TV shows! He’s starred in films like The English Patient, Shakespeare in Love, the Bridget Jones movies, Love Actually, and more recent hits like The King’s Speech and 1917. He’s also well-known for his roles in the series Pride and Prejudice, The Staircase, and Lockerbie: A Search for Truth.
Don’t miss Young Sherlock! Add it to your watchlist on the TopMob: What to Watch app. Download the app now for daily TV recommendations and exclusive content.
Authors
James Hibbs writes about TV dramas for TopMob, covering shows on streaming services and traditional channels. Before becoming a writer, he worked in public relations, first at a business-to-business agency and then at Fremantle, an international TV production company. He has a BA in English and Theatre Studies, and a Level 5 Diploma in Journalism.
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2026-03-04 11:45