When Tina oversteps at daycare, a well-meaning effort to fix it takes a turn after a message is sent to the wrong chat; a surprise visit from Dave's mother leads him and Gemma to reconsider their careers and what comes next.

The officers make a poor impression on Holt's husband during his birthday celebration.

When Jake's investigation of a philanthropic leader is shut down, he seeks help from Amy and Holt.

Jake intervenes in Detective Boyle's relationship; Capt. Holt has a new opponent.

All the regional precincts compete in a mandatory training course; Amy runs into an ex.

As Charles' best man, Jake must be involved with important wedding decisions.

While Bob and Abishola struggle to pull Dottie out of her depression, Auntie Olu and Uncle Tunde come over to lift her spirits. WENDIE MALICK and MARILU HENNER guest star as Dottie’s friends, Jen and Trish.

Dave and Gemma host a memorable Thanksgiving in their new home; Dave's politically incorrect mother visits from out of town and meets the Butler family for the first time.

The Butlers visit a nostalgic, rundown restaurant from Calvin's childhood and encounter its owner, Jasper; Dave, Gemma and Dave's mother, Paula, pay a visit to Lamar in prison.

Friends come to show their support when Dr. Carter opens a medical facility for the underprivileged.

Walden dates an attractive 22-year-old (Hilary Duff), but ends up being more interested in her grandmother (Marilu Henner); Jake and Alan go on a trip.

Jim scrambles to tie up loose ends with Callie while he works to identify the murderer of a golf hustler.

Jim investigates Florida's multimillion-dollar gambling industry when the first female professional jai alai player is murdered; Jim's mother arrives for a dysfunctional family reunion.

The neighbourhood siren, whose husband left her, moves in with the Bowers.

The team caters a senior singles mixer hosted by Pepper McMasters.

Through Lexie, Meredith tries to get Derek interested in a patient's rare brain tumor; Callie ends up being annoyed when Mark and Arizona finally form a friendship; Teddy and Alex look into alternative surgeries for a superficial patient.

As P.J. looks to bring Jack back in time for the wedding, Bobby begins to have second thoughts about marrying Elsa.

Don and the team are put in the limelight when they search for jewels that go missing during an awards braodcast and Larry returns from his adventure.

The postal detectives are faced with a challenge when a letter from the futures turns up.

Simon's ex-wife has the final word when a corporation wants to buy out the firm.