MGM+’s Bosch: Start of Watch will do something the franchise has never done in over a decade on screen: tell a Harry Bosch story without Titus Welliver in the role. Cameron Monaghan, known for Shameless and Gotham, has been cast as a 26-year-old rookie version of the character, according to Variety, which broke the news that MGM+ had ordered the prequel series to production.
What “Replaced” Actually Means Here
The word “replaced” is accurate but comes with an important caveat: this isn’t a recasting of the character across the whole franchise, and Welliver isn’t being pushed out of the Bosch universe entirely. Start of Watch is a prequel set decades before the events of the original Bosch series, telling the story of Harry’s earliest year on the job — a period Welliver, now in his mid-60s, simply can’t play. Welliver continues to appear as the present-day Bosch in the spinoff Ballard, where he’s confirmed for a recurring role in Season 2, according to Collider.
Meet the New Harry Bosch
Monaghan, a 32-year-old BAFTA nominee also known to gamers as the voice of Cal Kestis in the Star Wars Jedi series, will star as a stoic, intensely observant young officer just beginning to develop the instincts that define the detective he becomes decades later, according to a character breakdown from TVLine. It marks his first time leading a television series since he began acting in 2002.
The Case That Defines His Rookie Year
Start of Watch is set in 1991 Los Angeles, placing Bosch’s earliest days on the force against the backdrop of the Rodney King beating and its aftermath — a period the show’s official logline describes as a city on edge, marked by racial tension, gang violence, and a fractured LAPD. Within that world, Bosch gets pulled into a high-profile heist and a web of corruption that tests his loyalty to the badge, according to Variety’s reporting on the series’ plot details. Unlike prior entries in the franchise, the series isn’t adapted from a specific Michael Connelly novel — it’s an original story, though Connelly remains closely involved as an executive producer overseeing the scripts.
Building Bosch’s First Partnership
Much of the season centers on Bosch’s relationship with his training officer, Eli Bridges, a Vietnam veteran played by Omari Hardwick, whose mentorship shapes how the young cop learns to navigate both the streets and the LAPD’s internal politics. Series co-creator and showrunner Tom Bernardo described the project as a rare chance to explore the origins of a character audiences have followed for a decade, calling it a genuine privilege to dig into that uncharted territory, per Collider.
The Rest of the Squad
The supporting cast has filled out considerably since the show’s initial order, adding Ariana Guerra as fellow rookie officer Rosa, JD Pardo as Bosch’s foster-system-raised adoptive brother Cory, and a wave of additional names including William Fichtner, Kathleen Wilhoite, Seamus Dever, Raphael Sbarge, and Ryan McPartlin in various LAPD and criminal roles, according to casting updates compiled by the Harry Bosch Wiki from Deadline’s reporting.
Where Welliver Stands on All This
Welliver has addressed his absence directly. In an interview with Screen Rant earlier this year, he confirmed he has no involvement in Start of Watch whatsoever, onscreen or off, while also noting he’s been in touch with Monaghan and is looking forward to seeing what he does with the role, according to ScreenRant. Michael Connelly, who watched an early cut of the premiere, said he came away overwhelmed by how good it was, per ScreenRant’s coverage of his comments.
A Franchise Now Juggling Three Versions of Bosch
The timing adds an unusual wrinkle: Welliver isn’t the only actor stepping back from the role even as a new one steps forward. Ballard Season 2 has separately cast Irish actor Jack Meade-Mullarkey to play an even younger version of Bosch in flashback sequences, meaning the franchise will have three actors playing the character across its shows this year — Welliver in the present day, Monaghan as a mid-20s rookie, and Meade-Mullarkey in earlier flashbacks, according to ScreenRant.
When to Expect It
Bosch: Start of Watch began production in Los Angeles earlier this year and does not yet have a confirmed premiere date. When it arrives, the series will stream exclusively on MGM+ in the U.S., U.K., Italy, Germany, Spain, Latin America, Belgium, and the Netherlands.
