A series of ransomware threats leads to emergencies for the 118, including a helicopter crash at a hospital and an air traffic control tower system failure; the case of the realtor serial rapist goes to trial.
The 118 spring into action when a city-wide blackout and a record heatwave cause mayhem in Los Angeles; Chimney confides in Hen about Maddie's condition; Athena's worst nightmare comes true.
As the citywide blackout continues to cause mayhem in Los Angeles, Athena races to save her family from a tragedy; Eddie must make a difficult choice about his future; Maddie makes a life-changing decision.
Athena and the 118 are on high alert when a sniper is targeting members of the LAFD; Maddie makes a life decision.
The 118 has a day from hell with a never-ending series of bizarre emergency calls, including a man who tapes himself to a freeway billboard, and a restaurant manager who destroys his own business.