‘Bosch: Start of Watch’: Ariana Guerra Joins New Prequel Series!!

Ariana Guerra (Madres, Helstrom) has officially joined the cast of Bosch: Start of Watch, the upcoming MGM+ prequel that dives into Harry Bosch’s earliest days as a cop. She joins previously announced leads Cameron Monaghan and Omari Hardwick, who are already locked in to headline the series.

Set in 1991 Los Angeles, Start of Watch follows a 26-year-old Harry Bosch (Monaghan) during his rookie year in a city teetering on the edge. This is post-Rodney King L.A. — a fractured LAPD, racial tension simmering, gang violence surging. While handling routine calls, Bosch gets pulled into a high-profile heist and a web of corruption that will ultimately shape him into the detective fans know — the man who lives by the code, “Everybody counts or nobody counts.”

Who Is Ariana Guerra?

For Marvel fans, Guerra is no stranger to genre TV. She previously appeared as a series regular on Helstrom, one of Marvel’s darker and more short-lived small-screen entries. She’s also been a series regular on CSI: Vegas for CBS and Promised Land for ABC, and led the Amazon feature Madres, earning an Imagen Award nomination for Best Actress.

Unlike the mainline Bosch series based on the novels by Michael Connelly, Start of Watch doesn’t adapt a specific book. Connelly has described the prequel as “uncharted character territory,” pieced together from fragments of Bosch’s early years scattered across the existing novels. In other words, this is new ground for longtime fans. Deadline states:

Guerra will play Rosa, also a rookie LAPD officer and native Angeleno who brings uncommon maturity and street smarts to the job. Raised in the neighborhoods she patrols, she represents a new generation of cops in a post-Rodney King city. Beneath her confidence is a deep insecurity – shaped by a young pregnancy, a failed first career, and the pressure of providing for her child. During her probationary year, a budding romance with Bosch threatens her credibility, forcing Rosa to prove she can finish what she starts.

Behind the scenes, the series is produced by Fabel Entertainment and co-created by Tom Bernardo and Brian Anthony, with Bernardo serving as showrunner. Connelly executive produces alongside Henrik Bastin, Jamie Boscardin Martin, and Jasmine Russ. Theresa Snider co-executive produces for Hieronymus Pictures.