Donnie Wahlberg's Boston Blue is returning for a second season - so who is and isn't returning after a major recasting? Before Boston Blue, Blue Bloods followed the lives of the Reagan family, many of whom work for the NYPD under the leadership of NYC police commissioner Frank Reagan (Tom Selleck). Frank's father, Henry Reagan (Len Cariou), was also central to the show, alongside Frank's children: daughter Erin Reagan (Bridget Moynahan) and sons Danny (Wahlberg) and Jamie Reagan (Will Estes). The show aired from 2010 to 2024 before CBS announced a spinoff. Wahlberg's character is at the center of the spinoff, which picks up as the former NYPD officer takes on a position with the Boston P.D. He is then paired with detective Lena (Sonequa Martin-Green), the eldest daughter of a prominent law enforcement family. Despite keeping a lot of details the same, Boston Blue went through changes when Mika Amonsen was added to the cast as Sean, which was originated by Andrew Terraciano. Boston Blue found success and was renewed after breaking records for CBS. Meet the Cast of CBS Spinoff 'Boston Blue' - Including 'Blue Bloods' Alums Keep scrolling to see which cast members are - and aren't - coming back when the show returns for season 2: Donnie Wahlberg Sonequa Martin Green and Donnie Wahlberg Michele Crowe/CBS After making the move from New York to Boston, Donnie Wahlberg's character Danny introduced Us to the world of Boston Blue. Sonequa Martin-Green Christos Kalohoridis/CBS Boston Blue wouldn't be what it is without Sonequa Martin-Green's Lena being partnered on cases with Danny. Ernie Hudson John Medland/CBS via Getty Images Ernie Hudson's character Reverend Edwin Peters has made consistent appearances in season 1 - with the same expected moving forward. Maggie Lawson Christos Kalohoridis/CBS As the Superintendent of Detectives with Boston PD, season 2 will continue to follow Sarah (Maggie Lawson) trying to balance work and her personal life. Gloria Reuben CBS The Silver family is central to Boston Blue with Gloria Reuben playing the Boston District Attorney. Marcus Scribner Seacia Pavao/CBS (C)2025 CBS The first half of season 1 ended on a shocking note when Jonah (Marcus Scribner) appeared to have killed his father's murderer. Showrunners Brandon Sonnier and Brandon Margolis promised Us that Jonah would be the focus of the rest of the season. Mika Amonsen Christos Kalohoridis/CBS (C)2025 After Mika Amonsen was recast in the role of Sean, the character became a major part of the Blue Bloods spinoff. Xochitl Gomez John Medland/CBS Mika Amonsen hinted that Sean's romance with Penny (Xochitl Gomez) will continue to be explored - but it is unclear for how long. Which 'Blue Bloods' Stars Have Reprised Their Roles on 'Boston Blue' So Far? Bridget Moynahan John Medland/CBS Bridget Moynahan's Erin a.k.a Danny's sister was the first to cross over to Boston Blue from Blue Bloods. Moynahan has since directed an episode but a possible return on screen remains unclear. Marisa Ramirez Michael Gibson/CBS (C)2025 CBS Danny's girlfriend Maria (Marisa Ramirez) has found the time to make the drive to Boston several times, which is expected to continue as their romance is explored on the show. Andrew Terraciano Donnie Wahlberg and Andrew Terraciano CBS While Andrew Terraciano is no longer playing Sean, the actor expressed interest in returning to the franchise in some capacity, which the show's executive producers haven't ruled out. Tony Terraciano Tony Terraciano, Will Estes, and Vanessa Ray John Paul Filo/CBS Andrew Terraciano's brother, Tony Terraciano, played his sibling in Blue Bloods. Tony hasn't returned for Boston Blue but his character Jack was mentioned, which opened the door for an appearance.