Brookline Mid-century Modern House: See Glass – Kevin sees how the glass and windows for the house are manufactured. Radiant heat is installed under the driveway. In the second half: Nathan repairs a floor, Tom talks table saw techniques and Jenn improves foundation plants.
Suicide Squad – Desperate circumstances call for desperate measures, as Jake, Holt, Amy, Terry, Rosa and Charles must ally themselves with old enemies.
Cinco de Mayo – Jake, Holt and the squad decide to hold the annual Halloween Heist on a new date, Cinco de Mayo, in order to distract Terry from the stress of his upcoming lieutenant’s exam.
Return of the King – When Gina returns to the Nine Nine, Jake and Terry get drawn into her life. Holt learns that Charles’s son, Nikolaj, may be a genius. Rosa copes with an injury.
Ticking Clocks – 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.
The Bimbo – Holt and Jake investigate a case at Kevin’s university. Back at the precinct, Terry and Amy take the squad out for lunch.
Casecation – Work is so busy for Jake and Amy that they celebrate their anniversary while standing guard over a comatose patient in the hospital.
The Therapist – Charles brings Jake into a case when a therapist reports one of his patient is missing. Holt finds out Rosa has a new girlfriend that everyone else has met. Amy believes she has accidentally received a package meant for Terry.
Gintars – A visitor from Latvia causes Charles and Jake to investigate Nikolaj’s family. Holt and Amy bring in famed forensic scientist Dr. Yee to help close a case for Rosa.
The Golden Child – Jake helps Amy navigate the complicated relationship she has with her brother, David. Charles introduces some drama into an undercover mission involving Terry and Holt.