An unexpected third wheel puts a damper on Jake and Amy's tropical honeymoon. Back at the Nine-Nine, Terry experiences a crisis of confidence.

Jake and Charles investigate a case of Hitchcock and Scully's from the 1980s. Meanwhile, Amy's uniformed officers and Terry's detectives fight over limited resources.

Jake and Gina attend their 20th high school reunion. Back at the Nine-Nine, Charles helps Rosa with her love life.

After Gina makes a life-changing decision, she bestows a series of gifts on the squad. But first, an interpretive dance ...

Jake investigates a series of car thefts that point to an old frenemy. Meanwhile, the squad defends their favorite bar from interlopers.

A promise made to a grieving mother sends Jake spiraling into obsession as he and Rosa comb the scene of a baffling murder for clues.

Holt and Jake become suspicious of a new Nine-Nine employee. Amy goes full-on Marie Kondo to declutter the bullpen.

Amy and Jake hear conflicting stories as they investigate a sexual assault accusation. Holt refuses to believe an old nemesis is really dead.

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.

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.

A missing person case forces Jake to confront his issues with therapy. Holt invites Rosa and her new girlfriend to dinner. Terry overcompensates.

While celebrating their first anniversary, Jake and Amy realize they've had a communication breakdown over a major life decision.

A burglary investigation at Kevin's university reveals Holt's hidden insecurity. Amy and Terry's efforts to raise morale turn deliciously cutthroat.

As Hitchcock and Scully microwave a lasagna for exactly 21 minutes and 30 seconds, the squad races against the clock to catch a hacker.

Gina invites Jake and Terry over to her new place. Holt takes an interest in Nikolaj's education. Rosa rejects Amy's offer of a helping hand.

Mayhem and double-crossing overtake the squad as they try to distract Terry from his lieutenant's exam by kicking off the Halloween Heist on a new day.

Jake and Boyle hunt for a serial killer under the watchful eye of Commissioner Kelly. Terry learns that more money does indeed bring more problems.

To right a wrong, the Nine-Nine teams up with the worst of the worst of the NYPD. Terry sinks into deep denial about his future.

Jake finds his authority tested and thunder stolen by a beat-walking Holt amid a manhunt. Amy turns to Rosa for support during a personal crisis.

When an interim captain arrives at the Nine-Nine, Jake sets out to prove she's way too good to be true. Boyle rebrands his image.

Adrian Pimento resurfaces with a "Finding Dory"-esque memory problem. Jake tries to keep a secret from Boyle. The squad attends a mandatory HR seminar.

Jake revives the Jimmy Jab Games, with Boyle going full-on P.T. Barnum as host of the competition and Holt's timid new partner reluctantly joining in.

The squad suspects an inside job when guns and cocaine connected to a notorious crime boss go missing from the Nine-Nine.

Time flies as Jake and Amy focus on their family plans. Holt bristles over his tedious new job. A tooth-wielding Hitchcock searches for his Cinderella.

Holt risks his career by refusing to let his greatest nemesis have the last word. Boyle and Terry compete for Jake's tickets to an exclusive kid event.

The reappearance of Doug Judy lands Jake in hot water. Terry scrambles to replace Holt's treasured keepsake. The Nine-Nine gets a new vending machine.

When an apparent prank destroys a key piece of evidence, Holt taps the best detective he knows to interrogate the squad and bring the culprit to justice.

Jake doubles down on his daddy issues during a tense family reunion. Holt turns into a musical taskmaster over Terry's audition with the NYPD band.

A pudgy pooch, handcuffs and various other disasters delay the crowning of the squad's newest Amazing Human/Genius in the annual Halloween Heist.

Holt turns to Jake for help after a family member goes missing. Rosa battles Amy's ex for a coveted prize. Boyle and Terry team up on a business scheme.

Amy takes charge of the Nine-Nine during a citywide blackout, while Jake hits one snag after another as he races to her side.

Amy returns from maternity leave. Jake and Rosa work a difficult case.

The squad takes up Holt on an offer for a weekend getaway.

Captain Holt and Amy manage an understaffed precinct. Jake and Charles investigate.

Jake and Amy create a system to balance work and childcare and Rosa gets a new houseguest.

Jake takes an old friend for a ride.

When the FBI takes over a high-profile case, Jake keeps digging. Amy and Rosa negotiate with O'Sullivan and the police union.

Jake and Terry accompany Charles to the funeral of his Great Uncle Pappy — and uncover a family secret. Rosa nudges Holt back into the dating pool.

Amid planning for a vow renewal ceremony, Holt makes a big announcement — one that he asks Jake not to share with Amy. Plus, Cheddar wears a bow tie!

The squad takes stock of its eight years together and looks toward the future.