Guy Ritchie is back in Sherlock mode, only this time it is a series and the detective is barely out of school. Prime Video just dropped the first trailer for Young Sherlock, and it plays like a fugitive thriller smashed into an origin story. Also, yes, Moriarty shows up early. As a helper. For now.
What the trailer tees up
Hero Fiennes Tiffin steps in as Holmes, who gets slammed with accusations of murder and larceny and ends up on the run. Clearing his name becomes the first big case, and the twist is his reluctant partner: James Moriarty. The footage leans hard into scrappy chases, bruising fights, and a London that feels busy and alive, with detours beyond England when the conspiracy widens.
The setup and the scope
This is Holmes before 221B, still an impatient, sharp-edged teenager who has not yet turned into the legend. The story puts him in a vivid Victorian world and sends him abroad when the investigation scales up. The case threatens his freedom, spirals into something global, and builds toward a blowout that reshapes his life trajectory.
Release plan
Season 1 runs eight episodes and premieres March 4, 2026 on Prime Video.
Who is involved
Ritchie directs the series, returning to the character he previously tackled on the big screen with Robert Downey Jr. and Jude Law. Matthew Parkhill writes and serves as showrunner and executive producer.
- Cast: Hero Fiennes Tiffin as Sherlock Holmes; Donal Finn; Zine Tseng; Joseph Fiennes; Natascha McElhone; Max Irons; Colin Firth
Executive producers include Guy Ritchie, Dhana Rivera Gilbert, Marc Resteghini, Simon Maxwell, Ivan Atkinson, Simon Kelton, Colin Wilson, Harriet Creelman, and Steve Thompson. The series is produced by Motive Pictures.
Quick takeaway
Ritchie doing a young, combustible Holmes with Moriarty in the mix from day one feels like a swing. If the show keeps the trailer’s snap and scale, this could be a fast, punchy detour before the detective becomes the man at Baker Street.