<P> Donnie Wahlberg (Danny Reagan), Bridget Moynahan (Erin Reagan), Will Estes (Jamie Reagan), and Len Cariou (Henry Reagan) are first credited . Then Sami Gayle (Nicky Reagan - Boyle) is credited next, marking the fourth season she has been included in the opening credits . Tom Selleck (Frank Reagan) receives an "and" billing at the close of the main title sequence . Amy Carlson (Linda Reagan) left between Seasons 7 and 8 . </P> <P> Marisa Ramirez, as Danny's partner Detective Maria Baez, and Vanessa Ray, as Jamie's partner Eddie Janko, continue to receive "also starring" billing for season 8 . Appearing regularly and receiving "special guest star" billing are Gregory Jbara as Deputy Commissioner of Public Information Garrett Moore, Robert Clohessy as Lt. Sidney Gormley, and Abigail Hawk as Detective Abigail Baker, Frank's primary aide . </P> <Table> <Tr> <Th> No . overall </Th> <Th> No. in season </Th> <Th> Title </Th> <Th> Directed by </Th> <Th> Written by </Th> <Th> Original air date </Th> <Th> Prod . code </Th> <Th> U.S. viewers (millions) </Th> </Tr> <Tr> <Th> 156 </Th> <Td> </Td> <Td> "Cutting Losses" </Td> <Td> David M. Barrett </Td> <Td> Siobhan Byrne O'Connor </Td> <Td> September 29, 2017 (2017 - 09 - 29) </Td> <Td> 801 </Td> <Td> 10.04 </Td> </Tr> <Tr> <Td_colspan="8"> Erin pleads with Danny, who has been contemplating retirement since Linda's death in a rescue helicopter crash, to help her with a case involving her ex-husband, Jack (Peter Hermann) who's been attacked in his office . Jamie and Eddie go undercover as a couple to bust a shady drug dealer; new mayor Margaret Dutton (Lorraine Bracco) butts heads with Frank . </Td> </Tr> <Tr> <Th> 157 </Th> <Td> </Td> <Td> "Ghosts of the Past" </Td> <Td> John Behring </Td> <Td> Kevin Riley </Td> <Td> October 6, 2017 (2017 - 10 - 06) </Td> <Td> 803 </Td> <Td> 9.49 </Td> </Tr> <Tr> <Td_colspan="8"> Frank receives an order from the mayor to attend the annual West Indies parade, which this year is honoring a man who served time for conspiring in an attack against the police . Meanwhile, Danny and Maria investigate the return of Selena Moore (Caroline Pluta), who suspiciously disappeared as a teen 13 years ago . Also, Jamie and Eddie try to help a young woman they believe is being exploited by Congressman Richard Walters (Richard Thomas). </Td> </Tr> <Tr> <Th> 158 </Th> <Td> </Td> <Td> "The Enemy of My Enemy" </Td> <Td> Robert Harmon </Td> <Td> Ian Biederman </Td> <Td> October 13, 2017 (2017 - 10 - 13) </Td> <Td> 802 </Td> <Td> 8.98 </Td> </Tr> <Tr> <Td_colspan="8"> Erin's case against human trafficker Chao Lin (Tia Carrere) faces difficulty when the presiding judge falls off a roof to his death . Danny and Baez investigate, while also trying to protect a key witness for the prosecution . Elsewhere, Frank's enhanced public safety initiative is opposed by Mayor Dutton, but gains a surprising ally, City Council Speaker Regina Thomas (Whoopi Goldberg). </Td> </Tr> <Tr> <Th> 159 </Th> <Td> </Td> <Td> "Out of the Blue" </Td> <Td> David M. Barrett </Td> <Td> Brian Burns </Td> <Td> October 20, 2017 (2017 - 10 - 20) </Td> <Td> 804 </Td> <Td> 9.08 </Td> </Tr> <Tr> <Td_colspan="8"> Danny and Baez work the case of a detective who was gunned down prior to testifying against a career criminal . Also, Frank personally investigates when Garrett is attacked by a SWAT team outside his home, and Erin brings in a confidential informant against Anthony's wishes . </Td> </Tr> <Tr> <Th> 160 </Th> <Td> 5 </Td> <Td> "The Forgotten" </Td> <Td> Ralph Hemecker </Td> <Td> Allie Solomon </Td> <Td> October 27, 2017 (2017 - 10 - 27) </Td> <Td> 805 </Td> <Td> 8.29 </Td> </Tr> <Tr> <Td_colspan="8"> Danny and Baez investigate the murder of a single mother whose ex-husband has a documented history of violence . Also, Frank deals with the fallout when Mayor Dutton eliminates solitary confinement in prisons, while Jamie's effort to save a young woman who overdosed on heroin has unexpected consequences . </Td> </Tr> <Tr> <Th> 161 </Th> <Td> 6 </Td> <Td> "Brushed Off" </Td> <Td> Eric Laneuville </Td> <Td> Daniel Truly </Td> <Td> November 3, 2017 (2017 - 11 - 03) </Td> <Td> 806 </Td> <Td> 9.27 </Td> </Tr> <Tr> <Td_colspan="8"> When a famous basketball player is found dead of an apparent drug overdose, Danny and Maria look into his possible ties to a local drug gang . Also, Erin revisits the case of a man she may have wrongfully convicted nine years ago, and Frank is approached by Archbishop Kearns (Stacey Keach) regarding an eviction matter Jamie and Eddie are working on . </Td> </Tr> <Tr> <Th> 162 </Th> <Td> 7 </Td> <Td> "Common Ground" </Td> <Td> David M. Barrett </Td> <Td> Siobhan Byrne O'Connor </Td> <Td> November 10, 2017 (2017 - 11 - 10) </Td> <Td> 807 </Td> <Td> 9.94 </Td> </Tr> <Tr> <Td_colspan="8"> A case turns personal for Danny when he works to protect a nurse, Faith Madson (Jessie Mueller), from her violent ex-boyfriend . Meanwhile, Shelly Wayne (Cassandra Freeman), an acquaintance of Frank's, comes to him with a theory regarding the death of an inmate . Also, Jamie and Eddie help deliver a baby, only to learn that the mother and her family are undocumented immigrants living in deplorable conditions . </Td> </Tr> <Tr> <Th> 163 </Th> <Td> 8 </Td> <Td> "Pick Your Poison" </Td> <Td> Heather Cappiello </Td> <Td> Kevin Wade </Td> <Td> November 17, 2017 (2017 - 11 - 17) </Td> <Td> 808 </Td> <Td> 9.25 </Td> </Tr> <Tr> <Td_colspan="8"> Eddie makes a questionable arrest of a man revealed to be a college acquaintance who once humiliated her in a frat house . Frank learns one of his best lieutenants tested positive for marijuana after a trip to Colorado, and gets caught between department regulations and Mayor Dutton's stance on making pot legal . Meanwhile, Danny and Baez investigate a murder linked to a white supremacist group . </Td> </Tr> <Tr> <Th> 164 </Th> <Td> 9 </Td> <Td> "Pain Killers" </Td> <Td> John Behring </Td> <Td> Ian Biederman </Td> <Td> December 1, 2017 (2017 - 12 - 01) </Td> <Td> 809 </Td> <Td> 8.84 </Td> </Tr> <Tr> <Td_colspan="8"> As Danny and Baez join a narcotics task force to track down a drug supplier at a prep school, Baez comes into contact with fentanyl and is soon fighting for her life from an accidental overdose . Also, Jamie and Eddie work to protect a rehabilitated sex offender whose neighbors are angry he lives in their apartment building, and Frank forms an unlikely alliance with Mayor Dutton when the Governor refuses to involve the NYPD during a major state trooper initiative . </Td> </Tr> <Tr> <Th> 165 </Th> <Td> 10 </Td> <Td> "Heavy Is the Head" </Td> <Td> David M. Barrett </Td> <Td> Brian Burns </Td> <Td> December 8, 2017 (2017 - 12 - 08) </Td> <Td> 810 </Td> <Td> 9.40 </Td> </Tr> <Tr> <Td_colspan="8"> Erin is conflicted when Jamie and Eddie ask her to help drop old charges against a man, Parker Mack (Spencer House), who just bravely rescued a woman from a local hostage situation . Meanwhile, Danny and Baez work a case involving car thieves and discover the leader is Victor Lugo (Nick Cordero), a mobster they've dealt with before . Also, Baker receives a job offer which Frank learns may have strings attached . </Td> </Tr> <Tr> <Th> 166 </Th> <Td> 11 </Td> <Td> "Second Chances" </Td> <Td> Deran Sarafian </Td> <Td> Kevin Riley </Td> <Td> January 5, 2018 (2018 - 01 - 05) </Td> <Td> 811 </Td> <Td> 9.98 </Td> </Tr> <Tr> <Td_colspan="8"> When a journalist disappears while working on an exposé about an innocent man serving time for murder, Danny and Baez hope that reexamining the original case will help find her . Also, Frank reluctantly speaks out against an initiative led by Erin's office to consider drug abuse as a disease first, and a crime second . </Td> </Tr> <Tr> <Th> 167 </Th> <Td> 12 </Td> <Td> "The Brave" </Td> <Td> Tom Moore </Td> <Td> Siobhan Byrne O'Connor </Td> <Td> January 12, 2018 (2018 - 01 - 12) </Td> <Td> 812 </Td> <Td> 10.17 </Td> </Tr> <Tr> <Td_colspan="8"> Anthony is shot while interviewing a witness for an upcoming murder trial . Despite their differences, Danny takes up the case to find out who was responsible, telling Erin that Anthony is still "one of us". Also, Jamie and Eddie get in the middle of a standoff between a police lieutenant and a developmentally disabled man posing as an officer, and Nicky prepares to take the police exam over her mom's objections . </Td> </Tr> <Tr> <Th> 168 </Th> <Td> 13 </Td> <Td> "Erasing History" </Td> <Td> Jane Raab </Td> <Td> Daniel Truly </Td> <Td> January 19, 2018 (2018 - 01 - 19) </Td> <Td> 813 </Td> <Td> 9.45 </Td> </Tr> <Tr> <Td_colspan="8"> When Henry is the key witness on Danny and Baez's case, his meddling pushes Danny's buttons until he leads them to valuable information . Also, Nicky shocks her family by siding with her activist friend, Christie (Naian Gonzalez Norvind), who defaced the NYPD flag at One Police Plaza, and Jamie and Eddie learn a parole officer is taking advantage of his power over parolees . </Td> </Tr> <Tr> <Th> 169 </Th> <Td> 14 </Td> <Td> "School of Hard Knocks" </Td> <Td> Alex Zakrzewski </Td> <Td> Ian Biederman </Td> <Td> February 2, 2018 (2018 - 02 - 02) </Td> <Td> 814 </Td> <Td> TBD </Td> </Tr> </Table> <Tr> <Th> No . overall </Th> <Th> No. in season </Th> <Th> Title </Th> <Th> Directed by </Th> <Th> Written by </Th> <Th> Original air date </Th> <Th> Prod . code </Th> <Th> U.S. viewers (millions) </Th> </Tr>

Who is playing the new mayor on blue bloods