A box truck crashes into the station, causing a power outage and triggering a dangerous fire. Meanwhile, Sharon and Bode's ex-girlfriend, Cara, face multiple medical emergencies.

A former inmate firefighter harboring a grudge against Sharon returns to carry out his revenge.

The crews respond to mass chaos and injuries when a ride malfunctions at the annual Edgewater town fair. Meanwhile, Sharon receives life-changing news.

The station 42 crew responds to an out-of-control blaze at a wellness retreat, and the third rock crew tries to protect one of their own from a dangerous overdose.

The station 42 and Three Rock crews face a daring rescue when a massive mudslide tears through Edgewater. Meanwhile, Bode's freedom is on the line at his parole hearing.