As Eddie prepares to become a father, the rest of the crew's wagering gets out of control, forcing Terry to ban all gambling from the firehouse. The crew finds creative ways to bet behind Chief's back, causing Lucy to fall into debt.

When a perverted arsonist strikes Tacoma, the TPD and the TFD must put aside their rivalries to solve the case. To everyone's surprise, the two crews discover they are not as different as they think, but how long can the lovefest last?

Councilwoman Price tells Terry to find the author of an anonymous firefighter blog from the station and shut it down. With everyone a suspect, no one can be trusted. How quickly will they turn on each other? Who will crack? And Whodunnit?

Longing for a female friend, Lucy convinces Chief to transfer firefighter Delilah Dunn to the station while guys on the crew try to find a macho match to their energy. Meanwhile, Eddie takes Councilwoman Price for a walk on the wild side.

Station 24 is picked to make public service announcements, forcing them to work with the buff and handsome C-Team and their new transfer Delilah. Terry buys a gas-guzzling truck and Eddie can't help but take him for a ride.

Wolf Boykins returns to lead the fire station choir, the Ex-SING-guishers. Eddie teases Granny for joining the group but soon finds himself vying for a spot as the lead whistler. Lucy, meanwhile, convinces Chief to let her look for a more female-friendly uniform.

When Lucy gets injured on the job, Eddie is tasked with heading a peer counseling session that leads the crew to learn more about themselves.

Ike's mean twin brother Mike pays him a visit and asks for a life-changing favor. Meanwhile, the crew takes DNA tests, Granny discovers his Jewish heritage and Terry is devastated to learn that Lucy's genes are more Penisi than McConky.

Terry learns some sexy new dance moves to impress Vicky at the fireman's ball. Ike volunteers to be Andy's wingman, and Lucy discovers her date is more like his mother than she realized.

As the Firefighter's Ball rages on, things go off the rails. Terry and Eddie battle it out, Ike deals with Andy after too many drinks, Lucy struggles to get alone time with her date, and Granny finds a way to ease the tension with his date.

It's a spooky evening for the crew when they have to answer a call at a haunted house. While they navigate the haunted halls looking for the source of the fire, each of them must confront their greatest fears.

The holiday season has arrived at the firehouse and everyone is feeling jolly... except for Eddie. In order to get good year-end reviews, Lucy, Andy, Ike, and Granny try their hardest to get him in the Christmas spirit.

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.

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.

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.

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.

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.

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.

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.

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

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

Eddie learns his divorce lawyer was never really a lawyer and that his multiple divorces were never really finalized. The crew chips in for the latest Pedalton bike for the station but all fall for the same trainer.

It's Thanksgiving Day in the station, and as usual, Terry wants to do everything his way, but no one gets their way once an engine breaks down. Spatchcock, an irritating mechanic, is summoned at the TFD.

The annual TFD Pickleball Tournament is underway and Terry & Eddie's team are long-running-and-very-cocky station champs, but the crew has plans to finally take them and their attitudes down.

The Firefighters are out on a call when a fire breaks out at home Station 24.