Jake Peralta is a talented but carefree detective at Brooklyn's 99th Precinct. But when Captain Ray Holt takes over, he is determined to make his dysfunctional team into the best squad in Brooklyn.
When Peralta turns up late for morning roll call, an irritated Captain Holt responds by assigning him to a minor graffiti case and then closely monitoring his every move
For the first time in his career, Peralta has a growing number of cases that he just can't seem to solve, and the other detectives are worried that his bad luck will rub off on them
Peralta meets an attractive medical examiner, Dr Rossi, at a crime scene, but he annoys his colleagues when his attempts to get together with her cause a hold-up with an autopsy report
Peralta is frustrated when a detective from Major Crimes takes over a murder case that he is close to solving and steals his thunder
On Halloween night, one of the busiest evenings of the year for a police precinct, Santiago - who detests the holiday - is forced to put on fancy dress and go undercover on a street patrol with Boyle
Peralta jumps the gun and makes an arrest without enough evidence, leaving himself only 48 hours to collect the proof he needs before the suspect is released
Peralta is overjoyed when his hero, veteran crime reporter Jimmy Brogan - guest star Stacy Keach, spends some time at the precinct
When Sal's Pizza, one of Peralta's favourite haunts, burns down, the fire marshal assumes the owner is prime suspect in the investigation
Santiago decides to host a Thanksgiving dinner at her apartment for all of her colleagues at the precinct, but the celebration risks turning into a holiday disaster when the catering falls flat
Captain Holt receives death threats and Peralta is put in charge of his security - a job he enjoys and abuses as much as he can. Santiago attempts to get the precinct to take an Xmas photo for Holt.
To catch the Pontiac Bandit, a car thief he has been tracking for years, Peralta attempts to make a deal with a suspect Diaz has just arrested
Peralta and Santiago's ongoing bet about who can make the most arrests comes to an embarrassing conclusion and Boyle receives a medal after he's shot in the line of duty
Back in the field, Sgt Jeffords prepares to join Peralta and Boyle to infiltrate a gym where steroids are being sold illegally, but Peralta has second thoughts about whether Jeffords is ready
While investigating a string of hotel robberies, Peralta is upset to discover that Santiago is considering leaving the precinct to work with his nemesis 'the Vulture' in the Special Crimes unit
Captain Holt invites the entire squad to his house to celebrate his birthday, but Jeffords struggles to keep everyone in line. Peralta and Santiago end up making a bad impression on Holt's husband.
Boyle's new romance has increased his self-confidence, but Peralta is forced to intervene before his colleague goes 'Full Boyle' and gets way too serious, much too soon, with his girlfriend
Peralta is in danger of losing his flat but has no money to buy his own place, so Gina does her best to help him find a new home. Holt and Jeffords organise self-evaluations for staff at the precinct.
The officers attend mandatory training exercises in which all precincts compete. Peralta is determined to win, but he is distracted by jealousy when Santiago runs into an officer she used to date.
Boyle asks Peralta to be his best man, but as well as helping out with cake tasting and choosing invitations, he must also persuade Boyle to start standing up to Vivian before the big day
When Peralta gets the weekend off, he enlists Jeffords to help him tackle a cold case that everyone thinks is unsolvable. Can the two of them crack the 'impossible' case once and for all?
Peralta suspects a civic leader of money laundering but his investigation is shut down by the police commissioner