A series of freeway car accidents leads to a catastrophic overpass collapse that endangers the lives of civilians and members of the 118.
A dry thunderstorm rolls over Los Angeles, bringing in a series of lightning strike emergencies for the 118 and leaves a first responder's life hanging in the balance; Chimney get a surprise from a visiting Albert.
The 118 faces emergencies at a spin class and a hair salon; a husband and wife find themselves in a compromising position; Buck discovers new cognitive abilities; Hen and Karen find out Denny has been seeing his biological father.
The Santa Ana winds bring in a variety of weirder-than-usual emergencies; a family dog retrieves a severed hand; a young woman sleep-drives into the station; Denny questions Hen and Karen about his biological parents.
The team races to save workers in a high-rise during a fire drill, car accident victims, and siblings fighting over a family heirloom; Buck gives Bobby surprising news; Eddie helps Christopher deal with the trauma caused by the tsunami.