Blue Bloods viewers are going to be in for a surprise when they see Danny's new "phenomenal" partnership on Boston Blue following his time with Baez. Donnie Wahlberg teased Danny's new partner Lena (Sonequa Martin-Green), telling TV Insider on Thursday, September 11, "[Their connection] starts with an investigation that Lena's working on, and Danny is allowed to help her due to the circumstance." After seeing by chance in Boston, Danny and Lena become a team.