Adrian Pimento shows up unexpectedly to seek Jake and Charles' help after claiming someone is trying to kill him; the rest of the squad endures a workplace conflict seminar.

A new captain at the Nine-Nine attempts to ingratiate herself with Jake and the squad by inviting them over to her house for a dinner party.

Jake leads a manhunt after an assassination attempt on a city councillor. Holt adjusts to his new position as a uniformed officer.

Desperate circumstances call for desperate measures as Peralta, Captain Holt and the team are forced to ally themselves with some old enemies.

Terry finds out whether or not he has passed the challenging lieutenant's exam, while Jake and Charles investigate a dangerous serial killer. Plus, Holt continues to fight with his arch nemesis, Commissioner Kelly.

In an attempt to distract Terry from the stress he's feeling around his upcoming lieutenant's exam, the squad decides to hold the annual Halloween Heist on Cinco de Mayo instead.

When Gina returns to the Nine-Nine, Jake and Terry get drawn into her life. Meanwhile, Holt learns that Charles' son, Nikolaj, may be a genius, and Rosa copes with an injury.

On an episode that takes place in real time, Jake and the squad must track down a hacker who has infiltrated the Nine-Nine's servers; Rosa deals with relationship issues; Hitchcock and Scully attempt to cook the perfect lasagna.

Holt and Jake investigate a case at Kevin's university, and back at the precinct, Terry and Amy take the squad out for lunch.

Work is so busy for Jake and Amy that they end up celebrating their anniversary while standing guard over a comatose patient in the hospital.