Original air date: 09/26/2017 Runtime: 21:30 min. Jake and Rosa assimilate to their new lives behind bars, but both are coping in very different ways. Jake bonds with his cellmate, Caleb (guest star Tim Meadows), and is forced to join a prison gang led by notorious inmate Romero (guest star Lou Diamond Phillips), in order to gain his protection. Meanwhile, in the women’s prison, Rosa puts Holt and Terry to the test by having them complete outrageous favors for her. Back in the precinct, Amy and Charles are doing all they can to exonerate their colleagues.
Original air date: 10/03/2017 Runtime: 21:48 min. When the warden (guest star Toby Huss) asks Jake to investigate Romero’s (guest star Lou Diamond Phillips) drug smuggling operation, Jake and Caleb (guest star Tim Meadows) find themselves caught between the loyalty Jake has sworn to both of them. Meanwhile, Amy is offered a deal by a local mobster who claims he can prove that Hawkins (guest star Gina Gershon) is guilty, but Holt and the rest of the gang think they have a safer plan.
Original air date: 10/10/2017 Runtime: 21:33 min. Now that he’s officially back at the precinct and desperate to solve a real case, Jake finds a loophole to get out of his temporarily designated desk duty. Unfortunately, that loophole rests on his ability to pass an official evaluation performed by Holt. While Charles provides Jake with moral support, Terry and Amy help Rosa, who believes Pimento may be cheating on her.
Original air date: 10/17/2017 Runtime: 21:18 min. The Nine-Nine embarks on its fifth annual Halloween Heist and, as usual, everybody has a plan and no one is safe. Relationships and friendships are tested as the title "Amazing Human Slash Genius" must be snagged by midnight, leaving everyone pitted against each other.
Original air date: 11/07/2017 Runtime: 21:38 min. To track down the infamous arms dealer Dan "Daniel" Valdano (guest star David Figlioli), Jake and Terry go undercover at an illegal gambling club, but when Holt gets involved to coach the two in the art of poker, his addiction resurfaces. Meanwhile, Boyle buys a food truck that was formerly used in a brutal string of murders without telling his investor, Amy, and Hitchcock and Scully challenge Rosa to a "Butt-lympics."
Original air date: 11/14/2017 Runtime: 21:37 min. The always unwelcome Vulture (guest star Dean Winters) pops back into Jake and Amy’s lives, threatening to swoop in and take something important away from them. Meanwhile, Boyle and Rosa must track down "Sergeant Peanut Butter," the kidnapped NYPD horse that Charles envies, and Holt challenges Terry to be less image-conscious.
Original air date: 11/21/2017 Runtime: 21:38 min. Jake and Amy attempt to get their parents to bond over Thanksgiving dinner, but their first holiday together as a family does not go well. Meanwhile, at the precinct, Holt and Kevin’s special Thanksgiving pie is stolen from his office and Holt searches through the ranks for the possible culprit.
Original air date: 11/28/2017 Runtime: 21:38 min. When Terry’s favorite author, DC Parlov (guest star Fred Melamed), returns to the precinct because his latest manuscript was stolen, Terry and Jake convince Rosa to go undercover with them at a fantasy fiction convention to find the culprit. As drama ensues between Parlov and another writer (guest star Rob Huebel), Terry admits that he’s been writing a book of his own. Back at the precinct, Holt, Amy and Charles take a forensics course, but Charles’ big mouth gets him in trouble.
Original air date: 12/05/2017 Runtime: 21:38 min. While the entire precinct attends a funeral in LA, Holt learns that he is in the running to become Chief Commissioner of the NYPD - his dream job. But after missing their flight back to New York, Jake must devise a variety of ways to get Holt back in time for the interview. Forced to stay with some estranged members of the Boyle family, Amy tries to convince everyone that she can be laid back, Terry panics about losing his first-class flight and Charles uncovers some new information about Rosa’s personal life.
Original air date: 12/12/2017 Runtime: 21:38 min. Rosa begs Jake to help her break some big news to her parents, but her plan is thrown off when they wrongly assume the two are dating. Then, when Seamus Murphy (guest star Paul Adelstein) returns to redeem the favor Holt owes him, the precinct searches for a loophole that will allow Holt to uphold his end of the bargain without breaking the law. Part 1 of 2.
Original air date: 12/12/2017 Runtime: 21:39 min. Rosa begs Jake to help her break some big news to her parents, but her plan is thrown off when they wrongly assume the two are dating. Then, when Seamus Murphy (guest star Paul Adelstein) returns to redeem the favor Holt owes him, the precinct searches for a loophole that will allow Holt to uphold his end of the bargain without breaking the law. Part 2 of 2.
Original air date: 03/18/2018 Runtime: 21:39 min. After Seamus (guest star Paul Adelstein) threatens Kevin (guest star Marc Evan Jackson), Holt devises an elaborate plan to hide him in a safe house, with Jake as his guard. Kevin is miserable as the 99 works overtime to find Seamus and take him down.
Original air date: 03/25/2018 Runtime: 21:36 min. Jake is called upon to negotiate a hostage situation with a jewel thief, only to discover that the culprit seems to be a familiar face. Amy and Gina help Charles with the high demands of his new food truck, and Holt panics when a member of the Police Commissioner selection committee decides to interview Hitchcock about Holt.
Original air date: 04/01/2018 Runtime: 21:58 min. Jake embarks on an all-night long interrogation in order to elicit a confession out of a suspect (guest star Sterling K. Brown). But when Captain Holt skips the opera in order to stay back and help, the two cops clash over how to get him to talk.
Original air date: 04/08/2018 Runtime: 21:38 min. Jake surprises Amy with an investigation into a string of arsons connected to her favorite crossword puzzle author, Vin Stermley (guest star David Fumero). Meanwhile, Gina helps Holt jazz up his Commissioner candidate speech, and Terry, Rosa, Hitchcock and Scully argue over who is most deserving of the new detective car.
Original air date: 04/15/2018 Runtime: 21:38 min. Jake invites his newly discovered half-sister (guest star Nasim Pedrad) to stay with him in New York, but when he and Amy realize she’s a bit of a nightmare, they must find a way to get her back home to Dallas. Gina tries to set Rosa up on a date, despite her intense resistance to the idea.
Original air date: 04/22/2018 Runtime: 21:28 min. When a fire destroys Charles' food truck, Pimento (guest star Jason Mantzoukas) unexpectedly shows up to the scene as the insurance agent. Meanwhile, Rosa helps Amy to see that it's okay to get excited about picking her wedding dress, and Gina and Terry coach Holt in the art of social media.
Original air date: 04/29/2018 Runtime: 21:38 min. Charles plans an elaborate scavenger hunt for Jake's bachelor party, but the day goes awry when the guys decide to take some short cuts instead. Meanwhile, Amy's bachelorette party escalates when the ladies realize she previously slept with a member of her soon-to-be wedding band.
Original air date: 05/06/2018 Runtime: 21:17 min. When Rosa responds to an active shooter alert, the rest of the squad is forced to stay back, desperately fearing for her safety. Feeling helpless, Jake frantically brainstorms ways to offer his assistance, Terry faces an existential crisis and Gina and Amy try to make themselves useful by fixing Rosa’s broken toilet.
Original air date: 05/13/2018 Runtime: 21:39 min. Rosa and Amy team up to take down their "white whale" suspect - a ruthless killer who has managed to elude them for seven years - while Terry helps Jake tackle his wedding planning chores. Then, Captain Holt and his rival, Olivia Crawford (guest star Allison Tolman), try to convince each other to step down in the campaign for Commissioner.
Original air date: 05/20/2018 Runtime: 21:54 min. Jake and Amy’s wedding day is majorly threatened, and Charles and the whole squad rush to help save it. Amidst the chaos, Holt hesitates to open the email that will indicate if he has won his campaign for Commissioner, despite Gina’s encouragement. Meanwhile, Terry gently pushes Rosa towards a potential love interest (guest star Gina Rodriguez).