The gritty world of Michael Connelly's beloved detective is expanding backward in time. Amazon MGM+ has significantly bolstered the cast for its upcoming prequel series, Bosch: Start of Watch, adding six pivotal actors to portray the cops, criminals, and figures who will shape a young Harry Bosch.

Joining the previously announced Cameron Monaghan as the rookie Bosch are Raphael Sbarge, Seamus Dever, Kenneth Miller, Marco Rodriguez, Rafi Gavron, and Ryan McPartlin. This ensemble brings a wealth of experience from across television, promising to populate the series' 1991 Los Angeles setting with compelling characters.

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Meet the New Faces of the LAPD and Its Underworld

The new additions will play key roles in Bosch's formative year. Seamus Dever steps into the boots of Officer Hastings, a no-nonsense training officer known as "Mr. Fix It." Ryan McPartlin will portray Detective Mike Garner, a stubborn CRASH unit detective who immediately becomes a thorn in Bosch's side. Raphael Sbarge takes on the role of Sergeant "Sunshine" Finn, a stern and intimidating superior whose high standards are legendary among new recruits.

On the other side of the law, the series introduces figures from the city's criminal landscape. Kenneth Miller will play Fremlin, a member of a crew led by the professional thief Cory (J.D. Pardo). Rafi Gavron is Restrepo, Cory's shrewd and fiercely loyal lieutenant. Marco Rodriguez joins as Max Vargas, an ex-con whose return to Los Angeles puts his son's life in jeopardy, adding a layer of personal stakes to the season's drama.

A City in Turmoil Shapes a Future Legend

Set against the backdrop of a Los Angeles rife with racial tension, gang violence, and a deeply divided police department, Start of Watch follows the 26-year-old Bosch as he navigates his first year on the force. The series promises to explore uncharted territory from Connelly's novels, detailing how a simple heist case pulls the idealistic rookie into a vast web of corruption that will fundamentally define the detective he is destined to become.

The cast also includes Omari Hardwick as Bosch's training officer, Eli Bridges, and Ariana Guerra as fellow rookie Rosa. They, along with veterans like William Fichtner, will help guide—or misguide—Bosch through the moral complexities of the era. This deep dive into origin stories continues to be a winning formula for streaming giants, much like Taylor Sheridan's definitive exploration of the Dutton family beginnings in '1883'.

Behind the camera, the series is a production of Fabel Entertainment, co-created by Tom Bernardo and Brian Anthony with Bernardo serving as showrunner. Michael Connelly executive produces alongside Henrik Bastin and others, ensuring the prequel remains faithful to the spirit of the Bosch franchise, which has become a cornerstone of Amazon's drama slate. The franchise's success demonstrates how a committed creative team can build a lasting television saga, similar to how the 'Bosch: Legacy' and 'Bosch: Ballard' series transformed Prime Video's crime offerings.

In a statement, Connelly expressed his enthusiasm for the project, calling it "a gift" to finally show fans how Harry Bosch became the iconic character they've followed for years. Showrunner Tom Bernardo echoed this, stating it's a "privilege" to explore how both Bosch and the city of Los Angeles were shaped during this turbulent period.

With its cast now firmly in place, Bosch: Start of Watch is poised to be a major addition to the streaming landscape. It joins a roster of highly anticipated book-to-screen adaptations, following in the footsteps of successful projects like Amazon MGM's blockbuster 'Project Hail Mary'. Fans of gritty police procedurals and character-driven drama won't want to miss the beginning of Harry Bosch's story.