In honor of Bobby Nash's sacrifice, the 118 comes together to dedicate the firehouse in his memory; 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; 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; 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; 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; a new AI call center assistant, meant to help, has begun to create more complications, and the 118 must intervene.
Harry's first day as a probie proves to be more challenging than Chimney expects; Eddie and Hen are called into court over a former patient that brings back some old demons.
Athena, Bobby and the 118 must rescue a family whose pick-up truck has been rigged with a pipe bomb that will detonate if the vehicle slows down and goes under 55 mph; Eddie has a rough transition into his new job; Buck makes a relationship decision.
Chimney is determined to find a missing Maddie amongst the chaos of St. Patrick's Day.
Athena investigates a robbery at a gas station; Bobby and the 126 race to rescue a novice diver who panics while in a shark cage; Eddie reaches his breaking point; Maddie shares some news with Buck, who realizes he has to come clean with Taylor.
The members of the 118 race into action when a woman falls over her balcony; Athena investigates when a bike rider is impaled on a stop sign; Eddie begins his therapy for his PTSD and survivor's guilt; Maddie fears the worst when Jee-Yun falls ill.
A social media influencer has an accident in a sauna; an emergency at a reality show wedding; a tragedy when a mother and her daughter go hiking; Maddie worries she has missed too many firsts with Jee-Yun.
When the Hollywood Reservoir dam breaks, Bobby and the 118 race into action to save passengers on a city bus that has crashed into a building several stories in the air; the team adjusts to life as first responders during the pandemic.
In the aftermath of the dam break, massive mudslides wreak havoc throughout Los Angeles; Athena fights to save herself and an agoraphobic woman after her house collapses; a group of pregnant women trapped in a submerged house.
The team races to save a man under siege by his high-tech smart home; a yoga teacher loses her vision; Athena hunts down a bank robber disguised by COVID-19 protocols; members of the 118's crew prepare for an out-of-state mission.
Athena investigates a mysterious murder during a neighborhood block party; the 118 rush to save lives endangered by a bomb threat; Chimney has a hard time keeping secrets when Maddie and Buck's parents come to town.
The 118 races to save the lives of workers trapped in a factory fire; Maddie reveals a painful family secret that causes Buck to confront his childhood and answer why he is the daredevil he is today.
The 118 has a day from hell with a never-ending series of bizarre emergency calls; a man tapes himself to a freeway billboard; a restaurant manager destroys his own business; Eddie feels a spark with Christopher's former teacher.
A man gets pinned under a Humvee; a garage band rocks out too hard; Michael notices strange behavior at a nearby apartment; Hen's mother unexpectedly arrives and announces she is moving to Los Angeles.