Athena, Bobby and the 118 "speed" to the rescue to save a family whose pick-up truck has been rigged with a pipe bomb which will detonate if the vehicle slows under 55 miles an hour. Meanwhile, Eddie has a rough transition into his new job, Buck makes an impulsive relationship decision and Hen is reluctant to accept her new partner in Chimney's absence.

Athena investigates a robbery at a gas station that takes an unexpected turn when the would-be victim turns the tables on her assailant. Meanwhile, Bobby and the 126 race to rescue a novice diver who panics while in a shark cage, and a house sitter terrified of spiders. Then, Eddie reaches his breaking point, Chimney returns to the 118 and 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 women falls over her penthouse balcony. Meanwhile, Athena investigates when a bike rider is impaled on a stop sign, Eddie begins his therapy for his PTSD and survivor's guilt and Maddie fears the worst when Jee-Yun falls ill.

The members of the 118 race to the rescue of a social media influencer when she has an accident in a sauna, then to an emergency at a reality show wedding, and finally a tragedy when a mother and her daughter go hiking. Meanwhile, Maddie worries she has missed too many firsts with Jee-Yun, May questions Athena's career path, and Hen and Karen attempt to recapture the fun.

The 118 races to the rescue when the 9-1-1 Call Center goes up in flames. Then, Bobby risks his life to save a trapped May, and Claudette, Buck and Eddie work together to help an injured electrician, and Chimney and his brother team up as firefighters for the first time.

After a mysterious death, Hen and Chimney put their lives in danger when they suspect that someone is playing God to make themselves look like a hero. Meanwhile, Eddie visits Texas, where he attempts to reconcile with his father.

Another day in the life of the 118, as its members race to rescue a cliffside wellness retreat guru after his followers turn on him. Then, they respond to an emergency call at an upscale hair salon. Meanwhile, Maddie contemplates returning to work, Eddie and May make decisions on their future, as do Buck and Taylor, and the 118 gathers for a surprise wedding.

When a blimp suffers mechanical failure and its engine catches fire, Athena and the 118 must rescue victims both inside and outside a packed sports stadium. Bobby and Athena drop off May on her first day of college and discuss honeymoon plans, while Maddie and Chimney go to couple's therapy.

Athena and the 118 race to rescue when a wedding proposal tragically intersects with a bank robbery, and then when a princess bride is literally stuck on her way to the altar. Athena talks a victim thru her grief; Maddie takes matters into her own hands as Buck finds a surprise visitor on his doorstep.

A series of freeway car accidents leads to a catastrophic overpass collapse that endangers the lives of civilians and members of the 118.