CHIN's

When Lucy's secret date with a Tacoma police officer ends in embarrassment, the firefighters and the local police struggle to manage the aftermath.

When Terry throws out his back, Eddie becomes the interim Chief, which creates tension over whose methods are best.

Terry is serious about his "No Station Birthday Parties" policy, but the Crew is set on ignoring it upon finding out it's Andy's 9th Leap Year birthday. Pulling it off might be mission impossible.

An upgrade at Station 24 brings Inferna, a new Artificial Intelligence system, intended to improve the station's efficiency and safety. While the crew enjoys the perks of a "smart" station, Eddie grows suspicious of Inferna's true agenda.

The station receives a sexual harassment complaint, requiring the Crew to participate in a sexual bias seminar. Eddie falls for the teacher and tries to navigate the thorny process of how to pick up the Sexual Bias Trainer.

A flashback to how Terry and Vicky met and were set up by Eddie as a prank years ago. Terry, Eddie and Vicky all have very different memories of the event, but all involve Terry eating.

It's time for the annual firehouse chili cook-off, and everyone is excited to impress the chief, but judge Terry is affected by his wisdom teeth surgery and the drugs that go along with it.

Lucy graduates to official Firefighter if she can survive the gang's pranks. She insists they don't go easy just because she's Chief's daughter.

The gang is quarantined at the station after being exposed to a potentially infected Capuchin monkey on an emergency call. Everyone deals in their own way.

Gloria's bilingualism comes in handy on Mitchell and Cameron's quest to adopt another child. Meanwhile, Jay and Manny help Lily get ready for a dance recital. Alex goes to her first prom, and Haley announces her future plans, which come as a shock to her family.