Michael enters surgery, Linc and Sucre race against the clock to retrieve the Holy Grail of their mission, and Scylla's game-changing secret is revealed.
Chimney relives his evolution as a firefighter, looking back at how he joined Station 118 and became the firefighter and paramedic he is today.
A series of freeway car accidents leads to a catastrophic overpass collapse that endangers the lives of civilians and members of the 118.
In the televisual equivalent of a rollercoaster ride, the deadly tug-of-war over Scylla intensifies, culminating in Michael falling into Company hands.
Just when Audrey thinks she's safe, the terrorists strike back; Dina faces possibly sacrificing her son to the cause.