The 118 rush to save lives in the aftermath of a massive train derailment.

The 118 races to rescue a little girl in a runaway hot air balloon and help with a city power outage caused by a hijacked tree-trimmer truck. Meanwhile, Athena's investigation into the serial rapist case puts her life in jeopardy.

The 118 fights an apartment building blaze and attempts a daring rescue of a blind woman trapped inside. When Athena responds to a simple accident call, she discovers a potentially more sinister crime. Meanwhile, Hen performs a risky medical procedure after an accident at a televised cooking show and Buck meets a retired firefighter and is inspired to reunite him with his lost love.

Eddie's journey to rescue a boy from a well turns into a mission to save himself from his past.

Maddie fears for herself and her co-workers when the call center is taken hostage.

The 118 responds to accidents at a bowling alley and a home renovation. Bobby and Michael take Harry camping and Chimney and Maddie rush into action when their romantic dinner date takes a wild-turn

The 118 responds to a viral stunt gone haywire and an epic first date fail. Meanwhile, Athena investigates a woman who doesn't remember being shot in the head and Eddie is forced to have a difficult conversation with Christopher.

The 118 responds to a skydiving trip gone wrong, a bank rep injured in a home repossession, a disaster at a couple's fishing trip and a lovestruck assistant whose lunch run ends in disaster. Meanwhile, Athena and the family come to terms with Michael's difficult health decision and Chimney's half-brother from Korea unexpectedly shows up at his doorstep.

The 118 responds to holiday-themed incidents, including a shopper pushed over the edge, a woman who is literally having a "Blue Christmas" and a luggage handler accident on a tarmac. Meanwhile, Maddie revisits her past to embrace her future and Bobby receives shocking news.

The 118 responds to debris from a meteor shower crashing into an apartment building and a deadly fire caused by a hazardous waste truck crash inside a tunnel. Meanwhile, Hen struggles with guilt over her ambulance accident, Bobby introduces Eddie to an old friend to help with his anger and Maddie receives an urgent call for help.

Emergencies include a skating mishap at an ice show, an accident involving a self-driving car and a fulfillment warehouse robot going rogue. Meanwhile, Eddie's after-hours fight club gets out-of-control and Hen struggles in her relationship with Karen

When a murder weapon from a case close to Athena in the early '90s resurfaces, flashbacks to 1989 show how Athena joined the LAPD and became the police officer she is today.

Athena and the 118 respond to bizarre emergency calls on Halloween, including a flock of crows terrorizing a field trip, an office employee having a close encounter with an eight-limbed creature and a ghost-like girl wandering a neighborhood. Meanwhile, Maddie remains convinced that she is doing the right thing in taking a 9-1-1 call into her own hands.

The 118 races to help protesters at a slaughter house, and a wife who finds herself trapped in a "rage room" with her husband's mistress. Meanwhile, Athena takes action after Michael, May, and Harry experience a traumatic traffic stop. Also, the team feels betrayed by Buck when his suit against the city goes to arbitration and Eddie turns to Lena in his struggles with his anger issues.

The first responders race to save workers in a high-rise during a fire drill; a mother and her sons involved in a perilous car accident; and squabbling siblings fighting over a family heirloom. Meanwhile, Buck delivers surprising news to Bobby, Eddie helps Christopher cope with the trauma of the tsunami, Hen and Karen debate expanding their family and Maddie decides to take action against a possible wife abuser.

Athena, Maddie, Bobby and the 118 races to save lives after a massive tsunami hits the Santa Monica Pier and Buck fears the worst when Christopher goes missing.

A massive tsunami hits the Santa Monica Pier, placing Buck and Christopher's lives in danger.

Athena enlists the 118's help when a teenager speeds out of control on the freeway. Meanwhile, a routine traffic stop uncovers a shocking kidnapping and Buck struggles with his recovery.