Athena enlists the 118's help when a teenager speeds out of control on the freeway; A routine traffic stop uncovers a shocking kidnapping; Buck struggles with his recovery.
Athena, Maddie, Bobby, and the 118 race to save lives after a massive tsunami hits the Santa Monica Pier; Buck fears the worst when Christopher goes missing.
The first responders race to save workers in a high-rise during a fire drill and a mother and her sons involved in a perilous car accident; Maddie decides to take action against a possible wife abuser.
Athena takes action after her family experiences a traumatic traffic stop; Buck's suit against the city goes to arbitration; Eddie turns to Lena in his struggles with his anger issues.
Athena and the 118 respond to bizarre emergency calls on Halloween; Maddie remains convinced that she is doing the right thing in taking a 911 call into her own hands.
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.
Emergencies include a skating mishap at an ice show, an accident involving a self-driving car and a fulfillment warehouse robot going rogue; Eddie's after-hours fight club gets out-of-control; Hen struggles in her relationship with Karen.
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; Bobby introduces Eddie to an old friend to help with his anger.
The 118 responds to a shopper pushed over the edge, a woman who is literally having a "Blue Christmas" and a luggage handler accident on a tarmac; Maddie revisits her past to embrace her future; Bobby receives shocking news.
The 118 respond to a skydiving trip gone wrong, a bank rep injured in a home repossession and a lovestruck assistant whose lunch run almost ends in disaster; Athena and the family come to terms with Michael's health.
The 118 responds to a viral stunt gone haywire, a disaster at a couple's fishing trip and an epic first date fail; Athena investigates a woman who doesn't remember being shot in the head.
The 118 responds to accidents at a bowling alley and a home renovation; Bobby and Michael take Harry camping; Chimney and Maddie rush into action when their romantic dinner date takes a wild-turn.
The 118 fights an apartment building blaze; Athena's response to an accident leads to a more sinister crime; Hen performs a risky medical procedure; Buck meets a retired firefighter and is inspired to reunite him with his lost love.
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; Athena's investigation into a serial rapist case puts her life in jeopardy.