During the town's talent show, a serial killer targets the winner as Marvin finds himself at the judging table to capture them in the act.

In an attempt to stop Marvin from forgetting about him, Stan and Dr. Pentos create a diabolical plan staging his disappearance.

In an attempt to become immortal, Marvin drinks a special potion that causes rapid de-aging. Meanwhile, the department hires a new lieutenant.

Flute enters the Grimsburg Miniature Competition and is accused of murdering the judge, Jebediah Cupps, after he disqualifies him. Flute tries to clear his name at the local middle school by recreating a miniature model of the crime scene. Then Stan joins his school's Trauma Club.

After being forced to take a desk role in the office, Flute decides to lead a double-life and become a dog-themed superhero named McSnuff.

Marvin and the team investigate the death of a morning TV host, in which former child star Lil' Betsy is the main suspect. In the process of the investigation, Marvin becomes consumed with his newfound celebrity status. With everyone rallying around Lil' Betsy, Marvin is determined to find her guilty.

When Flute forgets to buy Stan a gift for his birthday, he steals an A.I. Doll from the evidence locker named MO11Y, unaware that the doll is actually a murderer. When an investigation leads the precinct to Grimsburg's "Dolltown," Wynona is forced to confront her ex-boyfriend, Buddy, while Summers struggles to find the right moment to finally ask her out.

Flute and the team get the campy horror movie experience when, after a series of counselors are found murdered, they attempt to make the town’s summer camp slasher-proof. Meanwhile, Harmony tries to get Stan outdoors and away from screens.

Marvin must track down a missing teenage girl after her romantic interest is discovered decapitated.

After nepo baby Otis the Kid Detective is put on the force per pressure from the Mayor, Flute makes it his mission to get the kid to quit the force. But his plans to scare Otis away go too far, just as Flute grows a soft spot for him.

In order to win this year's Undies Award for best undercover operation, Flute infiltrates the Preggo crime family.

Roles get reversed in Flute and Summers' partnership after male sex workers start turning up dead.

When the criminals of Grimsburg go on strike, the police force gets furloughed.

It’s time for CrimeCon–Grimsburg's famed crime-themed convention. When Flute learns that the criminals at CrimeCon are celebrated, not the detectives, he makes it his mission to prove that celebrity criminal, Damien Flesher, is not the reformed cannibal he claims to be. While chaperoning his students at ConCon and questioning where he is in his life, Pentos meets the Pentos-tonix, a Pentos-themed acapella group. Pentos then has to prove to them that he has still "got it" and is the criminal mastermind they grew up idolizing.

Flute and Kang butt heads over Flute's relationship with Kang's Great Great... Great Granddaughter. After a bomb threat is called on Grimsburg's annual Virgin Pageant, the Grimsburg PD need to have a man on the inside and have Summers pose as a contestant. Wynona, a former winner, coaches him a la Miss Congeniality.

Marvin's investigation into an unknown serial killer, coined "the Boner" by local media for mutilating their victims with animal bones, is interrupted by a production crew who's in town to turn the case into a true crime limited series. Meanwhile, Stan grows close with the actor playing Marvin.