Wahlberg revealed that he initially questioned if he'd return as Danny Reagan before seeing it as a chance to play the character "in a different way" Donnie Wahlberg wasn't set on continuing Danny Reagan's story at first — but then he read the Boston Blue script.

A spin-off of ‘Blue Bloods,’ CBS’ ‘Boston Blue’ is a police procedural drama series that follows Danny Reagan, who transfers from the NYPD to the Boston Police Department. He is partnered with Detective Lena Silver,

After failing to get CBS to reverse its decision to cancel Blue Bloods (Wahlberg and his castmates “ fought tooth-and-nail ” to keep the show in its original incarnation on the air), the new series adds an additional chapter to Danny’s story and opens the door to other potential spinoffs.