The first season ends with Jake investigating a civic leader. After Commissioner Podalski shuts down the case, Jake turns to Amy and Capt. Holt to help him continue to find evidence. Elsewhere, Boyle encounters problems in his relationship with Vivian, causing Gina to try to cheer him up.
Charles asks Jake to be the best man at his wedding, a role that requires Jake's involvement in planning. Elsewhere, Terry, Amy and Gina start a new extreme diet; and Rosa makes a genuine apology—with some assistance from Holt.
The gang participates in Tactical Village Day, a training course and competition for all regional precincts, where Amy runs into a former boyfriend. Meanwhile, Holt gets hooked on a phone game; and Rosa gets upset with Boyle after he fails to invite her to his wedding.
Jake is buried under a mountain of personal debt, and he faces the possibility of losing his apartment unless Gina can help him out. Meanwhile, Holt and Jeffords conduct performance reviews; and Rosa and Boyle encounter a weekend squad officer.
Boyle enthusiastically pursues a new romance, but Jake steps in to keep him from moving too quickly. Elsewhere, Rosa and Amy have fun at the expense of a costumed crime fighter; and Capt. Holt has a new foe.
Jake probes a series of hotel robberies with Amy, but is upset when he learns she may leave the precinct to work with the Vulture in the Special Crimes unit. Meanwhile, Holt and Jeffords try to make their workplace more efficient.
Jake and Amy's competition for the most arrests draws to a close. Meanwhile, Charles receives the Medal of Valor, but the pain medication needed for treating his injury causes him to be a little too honest about what he thinks of his colleagues.
Jake is put in charge of Holt's security after the captain receives death threats. Meanwhile, Amy is greeted with a lack of enthusiasm when she tries to get a Christmas photo of the precinct; and Terry gets his mojo back.
A local pizza place burns down and the fire marshal (Patton Oswalt) rashly pins blame on the owner, prompting Jake to pull out all the stops to prove him wrong. Meanwhile, a computer virus at the precinct shares everyone's browser history.
Jake looks forward to a day spent with a former crime reporter (Stacy Keach) whom he admires, but the visit is tarnished when he learns that his comments about the precinct were considered on the record. Elsewhere, Terry and Charles work with Rosa to help her be less imposing on the witness stand.
Jake has 48 hours to collect evidence for an arrest he made without proof, and he asks the rest of the team to put in weekend overtime to help him. Meanwhile, Gina and Rosa compete in a pie contest, with Charles as the judge; and Holt helps Terry impress his in-laws.
Jake has a run of bad luck closing cases. Meanwhile, Amy turns to Rosa and Gina for help after she's asked to lead the Junior Policeman Program for troubled youth; and Boyle helps Sergeant Jeffords with a troublesome case.
Jake is assigned to investigate a graffiti case that he feels is beneath him, but things get complicated when he learns that the offender is the deputy commissioner's son. Elsewhere, Gina's psychic friend visits the precinct and evaluates Charles.
Jake Peralta, a gifted but lazy detective, has some growing up to do when a straitlaced new commanding officer takes over his precinct in the premiere of this comedy series following an eclectic group of New York detectives.