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. Meanwhile, Chief has a special gift for him that just might do the trick.

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.

As the Firefighter's Ball rages on, things go off the rails for the crew. Terry and Eddie battle it out while stuck in an elevator, Ike deals with an out of control Andy after he has a few too many drinks, Lucy struggles to get alone time with her date away from his mother and Wolf Boykins, and Granny finds a way to ease the tension with his date.

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. Meanwhile Eddie finds out he is up for a big promotion, but will Terry blow it for him before he gets a chance?.

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.

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. Terry is forced to confront the dangers of his daughter working as a firefighter and Andy comes to terms with a shocking family secret.

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.

Station 24 has been selected to create public service announcements for the city, forcing the gang to work together with the muscled and movie-star handsome C-Team and their newest transfer, Lucy's old friend Delilah. Meanwhile,Terry buys a gas-guzzling truck and Eddie can't help but take him for a ride.

When Fire Commissioner Eddie Penisi, Sr. shows up at the station unannounced, Eddie and Terry vie for his approval while the "commish" cunningly drives them further apart. Meanwhile, the rest of the gang embraces their inner nerd playing D&D to win the acceptance of their own illustrious dungeon master. 

Longing for another female friend, Lucy convinces Chief McConky to transfer firefighter Delilah Dunn to the station. Threatened by their female force, the guys on the crew desperately attempt to find a macho match to their energy. Meanwhile, Eddie takes Councilwoman Price for a walk on the wild side.

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?

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?

Let's get ready to.. GAMBLE! As Eddie prepares to become a Dad, the rest of the Tacoma FD crew's wagering is out of control, forcing Terry to ban all gambling from the firehouse. As a result, the crew finds creative ways to bet behind Chief's back, causing Lucy to fall into a hole of debt she can't climb out from!.