Stuck behind bars, Jake lands in trouble over some delicious contraband. Fellow inmate Rosa keeps Holt and Terry busy with a never-ending to-do list.

As the squad looks for ways to implicate the corrupt Lt. Hawkins, Jake puts his detective skills to work with help from his affable cannibal cellmate.

Freed from prison and back on duty, Jake hunts for a sneaker thief under Holt's watchful eye. Meanwhile, Rosa suspects Pimento of infidelity.

Jake pulls off a major surprise during the squad's annual Halloween heist, a cutthroat competition to claim the coveted title of Amazing Human/Genius.

An undercover operation brings out Holt's inner gambler. Rosa tries to out-laze Hitchcock and Scully. Charles buys a food truck with an unsavory past.

Nemeses plague the squad, as Jake and Amy's big day gets derailed by the Vulture, and Charles must find his missing equine foe, Sgt. Peanut Butter.

On Thanksgiving, alcohol provides a temporary fix to Jake and Amy's parental problems, and a pilfered pie awakens the ruthless interrogator in Holt.

Jake and Terry go undercover at a costume-packed fan convention when their favorite fantasy author reports his much-anticipated manuscript stolen.

After missing their flight home from a funeral in LA, Jake and the squad scramble to get Holt back to New York in time for a big interview.

Intensely private Rosa shares personal news with the team but wants Jake's help to tell her parents. Cyber Crimes steals the Nine-Nine's bandwidth.

Crime boss Seamus Murphy resurfaces to claim his promised favor from Holt, so Jake and Charles befriend the Murphy family's Fredo to get information.

After a threat from Murphy, Holt stashes husband Kevin in a safe house with Jake. Rosa goes undercover at a salon. Scully reveals an actual skill.

Tapped to negotiate a hostage situation, Jake realizes the perp is someone he knows. Meanwhile, tensions flare inside Charles's meatball food truck.

As Jake begins an intense interrogation of a wily dentist suspected of murder, an opera-bound Holt jumps in to assist. Sterling K. Brown guest-stars.

Jake brings Amy in on an arson case connected to her celebrity crush, a crossword puzzle author. The Nine-Nine gets a sweet new detective car.

After realizing they were suckered into a pyramid scheme, Jake and Charles try to take down the cultish group. Amy deals with an overeager officer.

Jake's attempt to connect with his half sister goes off the rails. Terry tries and fails to show his flexibility. Gina sets Rosa up on a blind date.

A familiar face pops up when disaster strikes Charles's food truck. Rosa offers to help Amy pick out a wedding gown. Holt sets up a Twitter account.

Charles's convoluted bachelor party plans frustrate Jake, Terry and Holt. At her bachelorette bash, Amy plays a revealing game of "Never Have I Ever."

An anxious Nine-Nine awaits news on Rosa after she enters an active shooter situation. Amy and Gina distract themselves by taking on a plumbing issue.

As Rosa and Amy hunt a criminal who escaped their clutches years ago, Jake takes over wedding prep. Holt faces off with his rival for commissioner.

When Jake and Amy suffer a wedding day crisis, the Nine-Nine attempts to salvage the nuptials. Holt receives news on his bid for the commissioner job.

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.