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Season premiere. While staking out the red-light district of San Diego, the recently demoted Cullen (Patrick Brammall) and Tolbeck (Tim Meadows) spot some suspicious activity. Meanwhile, Janice (Amy Sedaris) from Dispatch is not happy when Clint (Dylan McDermott), a former flame and co-worker, is brought in as Dispatch's new supervisor. Dylan McDermott and Amy Schumer guest star.

Cullen is tasked with helping Officer Charles Brock (Keegan-Michael Key) extradite a key witness in the Las Hormigas Cartel investigation but all hell breaks loose at 30,000 feet. Back at Dispatch, Clint begins to shake things up by introducing new technology to the department but not everyone is quite as thrilled.

Cullen tries to set boundaries as a worse-for-wear Brock comes to terms with his new reality. Meanwhile, Janice's frustration with the invasion of BopBot intensifies and Chief and Gary need to rectify a huge mistake. Keegan-Michael Key and Dylan McDermott guest star.

As Cullen and Tolbeck prepare to give Doris' family the news that she is finito, they get a surprise visit from FBI Agent Dustin Kasprowicz (Jason Mantzoukas). Meanwhile, Gary and Chief strategize their next move and Janice tries to convince Fatima (Sunita Mani) that they may need to start looking for new jobs. Jason Mantzoukas and Dylan McDermott guest star.

Leon (J.K. Simmons) throws himself a retirement party but Cullen and Tolbeck are wary of his intentions. Clint confronts Janice about her hatred for the BopBot, but the conversation quickly turns into a rehash of their romantic past. Dylan McDermott and J.K. Simmons guest star.

Disgraced and behind bars, former detective Josh Haldeman (Jake Johnson) is interrogated by Agent Kasprowicz. Back at Dispatch, Clint and the BopBots have successfully infiltrated the department and everyone's job may be on the line. On a stakeout, Cullen is stuck with a less than enthused new partner. Jake Johnson, Jason Mantzoukas and Dylan McDermott guest star.

Cullen is partnered with his girlfriend, Lieutenant Sophie Beyers (Beth Behrs), but as they exchange gifts to celebrate their 3 months minus 9 days anniversary, their close proximity may prove to be too much. Gary is on the run and needs to figure out what to do with Yaya. Fatima finds her voice and stands up to Janice. Beth Behrs guest stars.

Season finale. After losing yet another key witness in the Las Hormigas Cartel investigation, Cullen is forced to deal with the consequences... and FBI agent Dustin Kasprowicz. Janice returns to Dispatch to confront Clint and delivers shocking news. Joe Keery, Jason Mantzoukas, Dylan McDermott, Paula Pell and J.K. Simmons guest star.