Jake and Amy go on their honeymoon; Gina and Charles get into a family squabble; Terry tries to live up to his new nickname.

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.

Gina plays a high-stakes game of chess with Capt. Holt; Rosa and Amy take Gina out for a fancy brunch; Jake and Gina must use their wits to infiltrate a posh club.

Terry believes the Pontiac Bandit has gone back to stealing cars, but Jake tries to prove him wrong; the rest of the squad fight to keep Shaw's a police bar when some firemen stake a claim to it.

Jake and Rosa must deal with a mother in mourning when they work on a difficult murder case with confusing evidence.

Jake and Holt clash over the merits of a new hire in the 99th precinct. Terry, Amy, Rosa and Charles try to do something about the cluttered bullpen.

Jake and Amy investigate a difficult "he said, she said" case of sexual assault. Holt becomes suspicious after learning his lifelong arch nemesis died in a prison transport accident.

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.

Charles gets Jake involved in a case where a therapist reports one of his patients missing; Holt learns that Rosa has a new girlfriend whom everyone else has met; Amy thinks she mistakenly received a package for Terry.

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.

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

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.

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

Jake and Charles investigate a dangerous serial killer. Holt continues to spar with his rival, Commissioner Kelly. Terry tries to find a way to stay at the Nine-Nine.

Desperate circumstances call for desperate measures, as Jake, Holt, Amy, Terry, Rosa and Charles must ally themselves with old enemies.