Watson Series: Everything We Know About the New Sherlock Spinoff

The Watson series has been confirmed as a modern Sherlock Holmes spinoff already with two distinct versions: the CBS medical drama Watson, featuring Dr. John Watson in today’s world, and Prime Video’s Young Sherlock, an origin story set in the 19th century. Each spins the classic Holmes mythos in completely different directions — one through cutting-edge medical mystery, the other through a stylish period adventure.

Modern Medical Mystery: Watson (CBS)

Fresh Spin on Watson’s Role

Watson, starring Morris Chestnut as Dr. John Watson, takes a bold detour from the traditional Holmes narrative. Instead of sidelining Watson, the show places him center-stage in Pittsburgh as the head of the Holmes Clinic, exploring rare medical anomalies while solving crimes. It blends diagnoses and detective work in a way that gives a new, character-driven perspective to the Sherlock Holmes universe.

Timeline and Release

The series premiered on CBS on January 26, 2025, immediately following the AFC Championship Game, before settling into its Sunday evening slot in February. It was renewed for a second season in March 2025 before the Season 1 finale aired.

Season 2 debuted on October 13, 2025, airing Mondays at 10 p.m. ET/PT, marking a notable schedule shift from Season 1.

Sherlock’s Return & Cast Developments

Season 2 introduces a major twist: Sherlock Holmes returns, presumed dead, portrayed by Robert Carlyle—a casting that adds gravitas given his acting pedigree. Watson must now deal with secrets from his past and the emotional fallout of Holmes’s reappearance.

Storywise, the Season 1 finale challenged Watson morally and personally, as he chose to let Moriarty die and continued life forward without Sherlock’s presence.

Tone and Realism

The show’s tagline—”doc-detectives”—sums up the hybrid genre. The medical mysteries are inspired by real-life medical oddities, lending authenticity and intrigue.

Period Adventure: Young Sherlock (Prime Video)

A Stylish Origins Tale

Contrasting sharply with the modern setting of Watson, Young Sherlock dives into Sherlock’s younger self at Oxford in the 1870s. Hero Fiennes Tiffin plays a 19-year-old Holmes who gets embroiled in a sprawling murder and conspiracy, framed during his university years. Executive-produced by Guy Ritchie, the series promises action, humor, and Victorian flair reminiscent of his earlier Holmes films.

Cast, Crew, and Production

The cast includes Zine Tseng as Princess Gulun Shou’an, Dónal Finn as James Moriarty, with Colin Firth and Joseph Fiennes playing Holmes’s father and Mycroft, respectively. Showrunner Matthew Parkhill leads production, with Guy Ritchie directing and executive producing alongside Andrew Lane, Simon Kelton, and others.

Release Details

A New York premiere occurred on February 9, 2026, followed by a global release of all eight episodes on March 4, 2026 through Prime Video.

Comparing Two Confirmed Spinoffs

Narrative and Franchise Implications

Beyond format, these two spinoffs highlight how flexible the Sherlock Holmes mythos remains. One focuses on legacy and transformation—Watson rebuilding life without Holmes—while exploring the emotional cost of genius. The other goes backward in time, exploring how Holmes himself wound up legendary — a creative move that taps into youthful rebellion and investigator’s origin.

These approaches boost the franchise’s vibrancy—appealing to both crime-drama enthusiasts and period-piece fans. They also underscore brand strength: one looks to modern realism, the other to heritage and stylized storytelling.

Conclusion

The Sherlock Holmes universe is expanding in compelling ways. Watson reimagines the sidekick as a modern-day medical detective, offering drama, emotion, and mystery. Young Sherlock takes us to the iconic detective’s roots—infused with action, wit, and Victorian intrigue. Each is unique in tone, audience, and storytelling, yet both enhance the legacy of Holmes-related adaptations.

FAQs

What’s the main difference between Watson and Young Sherlock?

Watson is set in modern times, focusing on medical mysteries and emotional drama, while Young Sherlock transports viewers to the 1870s to reveal Sherlock Holmes’s early investigations in a stylish period setting.

When did each series premiere or will premiere?

Watson debuted on January 26, 2025, with its second season landing October 13, 2025. Young Sherlock premieres globally on March 4, 2026, after a New York premiere on February 9, 2026.

Is Sherlock Holmes present in Watson?

Yes, Sherlock returns in Season 2 of Watson, portrayed by Robert Carlyle. Season 1 initially treated Holmes as presumed dead.

How many episodes does Young Sherlock have?

There are eight episodes planned, all released simultaneously.

Who are the key creative forces behind each show?

Watson is created by Craig Sweeny, with Morris Chestnut starring and Robert Carlyle joining in Season 2. Young Sherlock is led by showrunner Matthew Parkhill and executive produced and directed by Guy Ritchie.

Donald Cooper

Professional author and subject matter expert with formal training in journalism and digital content creation. Published work spans multiple authoritative platforms. Focuses on evidence-based writing with proper attribution and fact-checking.