Eddie is forced to confront an unimaginable personal crisis. Hen and Karen jump into action after being thrust into a harrowing situation.

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.

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.

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.

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.

Athena revisits a painful part of her past while responding to a call, and Buck coaches Harry as he prepares for the firefighter CPAT test.

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.

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

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

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.

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.