Spinoff series of Blue Bloods, Boston Blue, premiered on October 17, 2025. The series will depict Donnie Wahlberg's Detective Danny Reagan relocating to Boston and joining the Boston Police Department after his younger son, Sean, gets into a horrible accident.

"Boston Blue" showrunners open up about the surprise "Blue Bloods" cameo in the premiere and recasting Sean for the spinoff.

Blue Bloods' Marisa Ramirez teases her Boston Blue cameo, Danny's future with Baez, and the challenges of long-distance love

The producers chose to “join the story in progress,” they say. Sean has already moved and adapted to life in Boston, Danny and Maria are in a relationship, and there’s a new family to learn about.

Tom Selleck's Frank Reagan vouches for his son, Danny, to Sarah Silver in an important off-screen phone call in Boston Blue's premiere.

Ernie Hudson hopes 'Blue Bloods' fans can suspend their disbelief about him returning to the universe — with a brand new role — in 'Boston Blue'

The premiere of Boston Blue Season 1 opens on a street in Boston, and in just a few minutes, everything unravels, crashing down out of control. Sean Reagan and his fellow officer Jonah walk upon some heavy blazing fire in a nearby office building.