Is ‘Boston Blue’ a Spinoff of ‘Blue Bloods’? All About the Upcoming CBS Series Expansion

Boston Blue is an upcoming television series that serves as an expansion of the Blue Bloods universe. While it isn’t being officially labeled a traditional spinoff, it does continue the story of one of the show’s most beloved characters

A New Chapter from a Familiar World

When CBS confirmed Boston Blue was in development, fans of Blue Bloods were both intrigued and emotional. After 15 seasons of the beloved police procedural, Blue Bloods became more than just a crime drama — it was a portrait of family, loyalty, and service.

Now, Boston Blue steps into that legacy — not as a carbon copy, but as a spiritual extension. The series is set in Boston, Massachusetts, and follows the life and career of one of the original show’s fan-favorite characters: Detective Maria Baez (played by Marisa Ramirez). After years of standing shoulder-to-shoulder with Danny Reagan on the streets of New York City, Baez has taken a bold step — relocating to Boston to take on a new leadership role within the Massachusetts State Police.

While this move might come as a surprise to some, it makes perfect sense in the larger arc of Baez’s character. Known for her street-smart intuition, deep empathy, and resilience, Baez has long been a steady force in Blue Bloods, even when operating in the shadow of the Reagan dynasty. In Boston Blue, she finally takes center stage.

What the Show Is — and What It Isn’t

CBS has been careful in its language. Boston Blue is not being marketed as a direct spinoff — there’s no “Reagan” in the title, and early press materials emphasize that it’s a “fresh story with shared roots.” But make no mistake: the DNA of Blue Bloods is in every frame.

The show retains the moral complexity, character-driven storytelling, and case-of-the-week format that fans expect. But it also promises a darker tone, more complex political themes, and a new ensemble cast that reflects the diversity and tension of Boston’s law enforcement and civic landscape.

Behind the scenes, Boston Blue will feature several key figures from the Blue Bloods production team, including executive producer Siobhan Byrne O’Connor and veteran writer Brian Burns — cousin of Blue Bloods creator Robin Green. Their presence ensures continuity, while also allowing the creative team to explore new territory.

Familiar Faces and New Stories

While Marisa Ramirez’s Baez is the emotional core of the new series, rumors suggest other Blue Bloods characters may appear in cameo roles. Danny Reagan (Donnie Wahlberg) is reportedly set for a special guest appearance in the pilot episode, offering Baez his blessing — and perhaps a challenge — as she begins her new journey.

There’s also chatter that Nicky Reagan-Boyle (Sami Gayle), Erin’s daughter, could return as a young legal advisor working with the Boston District Attorney’s office. Though unconfirmed, the possibility of connecting the next generation of Reagans to Boston Blue has fans buzzing.

The new cast will include both up-and-coming and seasoned actors. CBS has confirmed that the series will introduce a complex network of officers, detectives, and city officials who bring Boston’s unique political and cultural flavor to life. Expect Irish-American precinct traditions, academic tensions from neighboring Harvard and MIT communities, and hard-hitting cases involving everything from organized crime to cyber investigations.