Boston Blue got off to a strong start after that recasting with Donnie Wahlberg's Danny visiting Boston because his son suffered a serious injury. In the series premiere, which aired on Friday, October 17, Sean's (Mika Amonsen) night out with friend Jonah somehow led to them saving people stuck in a burning building. Amid the heroics, Sean was thrown by an explosion and ended up in a coma. Danny traveled from New York to Boston to be with his son - and somehow ended up solving a murder with Jonah's sister, Lena (Sonequa Martin-Green).