The Pontiac Bandit aka Doug Judy, is back in custody, after jamming up Jake and Rosa in his previous encounter with them. But when Rosa discovers that Judy knows the whereabouts of the "Giggle Pig" drug leader, Capt. Holt offers the perp a plea deal to help track down the drug kingpin. Meanwhile, Gina and Boyle are nervous that their parents might be getting too close, and Santiago makes Holt a Christmas gift against his wishes.
Jake and Amy have a case early in the morning, so they stay at a hotel overnight. Jake invites Sophia and Amy's boyfriend not knowing that Amy is planning on breaking up with him.
While attempting to catch a drug dealer, Jake and Charles reluctantly join forces with the nerdy lead investigator at the U.S. Postal Service, Jack Danger. Meanwhile, the rest of the team helps Amy quit smoking.
The precinct goes into lockdown mode on Thanksgiving night, and Jake, who was left in charge, is confident in his ability to keep spirits high and avoid chaos. Amy is less confident, as things spiral out of control.
Jake hits it off with a woman at a bar, but later finds out she is the attorney for a perp he is trying to put in jail. Meanwhile, Gina and Charles work to put their relationship behind them, and Amy is pressured into running for union rep.
There's a mole in the precinct and Holt and Jake need to find out who it is before Deputy Chief Madeline Wuntch gets wind of it. Meanwhile, Terry and Rosa visit a "silent" disco to uncover new leads for their new drug task force.
The Peralta/Holt annual Halloween bet continues when Jake challenges the Captain that he can steal his watch before midnight. Meanwhile, Gina is upset that her dance team, Floorgasm, kicks her off the squad and Terry confronts her about her bad attitude.
The precinct holds a competition while on stand-by for a motorcade, Holt has another run-in with Deputy Chief Wuntch, Boyle needs to get an incriminating videotape from Hitchcock, and Rosa thinks Peralta still has feelings for Santiago.
Holt's old nemesis is in charge of the precinct inspection, Peralta and Jeffords investigate a stabbing before Jeffords goes in for his vasectomy, and Boyle needs a plus-one for his ex-wife's wedding.
Jake's undercover operation ends in a successful sting, until he learns one mobster has gotten away. Jake enlists Charles' help to track him down, and Holt tests the squad with practice drills. But can Charles keep his new secret from Jake?
Jake's latest investigation results in administrative leave, and, ultimately, his firing from the NYPD. Meanwhile, Charles goes into a funk after Vivian breaks up with him before their wedding, and the others try to cheer him up.
Jake and Terry try to solve an apparently unsolvable case, Amy lies to Holt in order to dodge work and escape for a romantic weekend away, while Gina and Rosa introduce Charles to "Babylon", their secret bathroom.
Jake tries to convince Charles to stand up to Vivian before the wedding, Terry struggles to stick to a diet after Amy and Gina give up, and Holt tries to get Rosa to make a sincere apology to an officer she offended.
Jake tries to set a new record on a training course, Rosa is angry when she does not get an invite to Charles' wedding, and Gina helps Holt overcome his newfound addiction to a game on his smartphone.
Due to his crippling debt, Jake faces losing his apartment, and asks Gina for help. Rosa and Charles clash with one of the weekend officers, and Holt and Terry ask their officers to conduct self-evaluations.
Jake tries to keep Charles from going "full Boyle" on his new girlfriend. Meanwhile, Rosa and Amy are reluctant to help an amateur caped crime fighter, and Holt faces competition for the presidency of a police organization he founded.
The officers in the precinct head over to Holt's house to celebrate his birthday, but they wind up making a poor impression on his husband.
Jake is hurt when Amy tells him that she is considering leaving the precinct, while Terry helps Holt redesign the precinct to make everyone more productive.
Jake begins to have second thoughts about putting Terry back in the field for a dangerous undercover assignment, while Rosa and Amy try to help Gina after she is robbed.
While Holt holds a celebration for Charles after he is awarded the Medal of Valor, Amy is forced to go on a ridiculous date with Jake after she loses their long-running bet.
Jake convinces Rosa to make a deal with a criminal in order to catch a car thief, while Charles makes an awkward return to the precinct, and Holt tries to get rid of two puppies.
When Holt receives death threats, he surprisingly puts Jake in charge of his security. Meanwhile, Terry undergoes a psych evaluation, and Amy tries to make the perfect holiday card for Holt.
Amy hosts a Thanksgiving dinner at her apartment for everyone at the precinct, but it soon turns into a disaster.
Jake's favorite pizza place burns down and he is determined to prove the owner was not responsible. Meanwhile, Amy is jealous of Rosa's being offered a promotion, and Terry and Gina have to hire a new IT specialist.
Jake is horrified when his hero, Jimmy Brogan, a crime writer, accompanies him on the job, and threatens to quote him in a damning article. Meanwhile, Rosa has to work on her attitude in court.
Jake stupidly arrests a male suspect despite having no evidence and only has 48 hours to prove he did it or release him without charge.
Jake makes a foolish bet with Holt that he can steal his Medal of Valor before Halloween is over, while Amy is forced to wear a costume while undercover with Charles.
A detective from Major Crimes takes over Jake's nearly solved murder case and steals his thunder.
Jake meets an attractive Medical Examiner, but their relationship slows down her work, much to his colleagues' annoyance. Meanwhile, Amy desperately tries to impress Holt.
With a backlog of unsolved cases, Jake finds himself in a slump. Meanwhile, Amy is put in charge of the Junior Police Program for at risk kids, but her efforts to inspire them fall flat.
