❚ We may earn commission from links on this page. Our editorial is always independent (learn more).
Young Sherlock casts 2 Game of Thrones legends for second season of hit show
Sherlock's upcoming adventures are beginning to take shape...
Daniel Smith/Prime
- Tilly Pearce
Published: Friday, 31 July 2026 at 11:38 am
Subscribe to Radio Times: 10 weeks for £10, including the Christmas double issue
Young Sherlock’s world is getting bigger with four new stars joining the main cast – including two Game of Thrones stars.
Ad
The Prime Video series, which followed the early adventures of the famous super-sleuth and soon-to-be enemy Moriarty, became one of the streaming service’s most-streamed original titles of all time upon its launch in March this year.
With season 2 starting filming in Palermo, Italy, Deadline has reported casting details for those joining the next exploits.
Among those being given main roles are Aidan Gillen, Indira Varma, Sophie Skelton and Olivia Williams.
Hero Fiennes Tiffin and Dónal Finn in Young Sherlock. Daniel Smith/Prime
Gillen and Varma both previously starred in Game of Thrones as Petyr Baelish AKA Littlefinger and Ellaria Sand, respectively, though didn't appear in any scenes together.
Gillen is also known for his roles in Queer as Folk, Mayor of Kingstown and Peaky Blinders.
Meanwhile, Varma has become a regular face on British TV, starring in ITV's Coldwater in September last year, and BBC smash-hit The Other Bennet Sister at the beginning of 2026.
Olivia Williams is best known for playing roles including Camilla Parker Bowles in The Crown, Lavinia Bidlow in The Nevers and, most recently, Tula Harkonnen in Dune: Prophecy.
Sophie Skelton starred in period fantasy drama Outlander as Brianna Mackenzie/Fraser.
Dónal Finn, Zine Tseng and Hero Fiennes Tiffin in Young Sherlock. Daniel Smith/Prime
While details about their roles are currently kept under wraps, they will be joining Hero Fiennes Tiffin and Donal Finn as Sherlock and Moriarty.
Also returning are Natascha McElhone (who plays Sherlock’s mother Cordelia), Max Irons (Mycroft Holmes) and Holly Cattle (Beatrice Holmes).
Unfortunately, there are some other characters who will not be returning – most notably Zine Tseng, who led the cast with Tiffin and Finn as Xiao Wei, AKA Princess Gulun Shou’an, whose story arc was completed by the season 1 finale.
Joseph Fiennes, Tiffin’s real-life uncle who played on-screen father Silas Holmes, will also not be returning.
Young Sherlock is available to stream on Prime Video – try Amazon Prime Video for free for 30 days. Plus, read our guides to the best Amazon Prime series and the best movies on Amazon Prime.
Add Young Sherlock to your watchlist on the Radio Times: What to Watch app – download now for daily TV recommendations, features and more.
Ad
Check out more of our Drama coverage or visit our TV Guide and Streaming Guide to find out what's on. For more TV recommendations and reviews, listen to The Radio Times Podcast.
Authors
Tilly PearceFreelance Writer
Tilly Pearce is a freelance TV journalist whose coverage ranges from reality shows like Love Is Blind to sci-fi shows like Fallout. She is an NCTJ Gold Standard accredited journalist, who has previously worked as Deputy TV Editor (maternity cover) at Digital Spy, and Deputy TV & Showbiz Editor at Daily Express US.
Ad
Ad
Get the Christmas double issue
Too much to watch at Christmas? Let Radio Times do the choosing to find something the whole family will enjoy.
Loading...
Ad
Loading...