In honor of Bobby Nash's sacrifice, the 118 comes together to dedicate the firehouse in his memory. Meanwhile, when a billionaire tech giant is involved in a life-or-death emergency, the team must race to his aid.

As a geostorm ravages Earth, Athena and Hen's space mission teeters on the edge. On the ground, the 118 battles chaos when technology goes rogue.

Athena and Hen face increasing dangers in space as friends both near and far try to get them home safely. Meanwhile, the 118 continues to help victims of the geostorm and falling debris.

As Athena and Hen navigate their way back home, Athena will be forced to confront what it means to live without Bobby.

The 118's beliefs are put to the test as they respond to emergency calls involving a Jack-o'-lantern and a few more jump scares than they were expecting on Halloween.

Athena must revisit a painful part of her past when answering a call for help. Meanwhile, the 118 takes a big step forward.

Hen's attempts at keeping her mysterious health issues private are starting to impact more than just her physical well-being. Meanwhile, Buck and Ravi decide Eddie needs a night out on the town.

Following Hen's firing, Chimney grapples with his decision and how it has affected the team. Meanwhile, a new AI call center assistant, meant to help, has begun to create more complications, and the 118 must intervene.

As Hen continues to seek out a diagnosis for her mysterious symptoms, her friends and family rally behind her. Meanwhile, Harry hits a wall in his attempts to complete the academy firefighting exam and looks for some much-needed motivation.

Harry's first day as a probie proves to be more challenging than Chimney expects. Meanwhile, Eddie and Hen are called into court over a former patient that brings back some old demons.

When a medical examiner becomes entangled in a dangerous situation during an autopsy, the 118 is called in to assist. Meanwhile, the 118 hosts an LAFD charity bachelor auction.

Maddie and Buck are blindsided by some unexpected news that turns their world upside down. Meanwhile, Buck and Eddie head to Nashville when they are selected to participate in the national firefighting games. The crossover continues on 9-1-1: Nashville S01E12 Spirit of the Games (II).

Eddie and Buck's flight back to Los Angeles is cancelled following the National Firefighter Games. Hoping to be home for Hen's birthday, they decide a cross-country road trip is the fastest way, until they get offtrack and Buck goes missing.