When a red flag warning sets the stage for a volatile day, a turf war between Station 42 and neighboring Drake County comes to a head.

Bode participates in a high school drunk-driving drill that unexpectedly reconnects him with a former classmate; Three Rock reopens with a new crew and high hopes.

Sharon is blindsided by a visit from her estranged mother, Ruby, whose sudden reappearance stirs up painful family history; Bode and Jake respond to a call from a troubled teen in a condemned building.

Station 42 responds to a dangerous fire at a beloved local smokehouse where Jake is forced to confront memories of his late father and the place they once shared.

The team responds to a dangerous fire at the local drive-in movie theater where they must enlist civilians to help stop the spread; Bode and Sharon wrestle with the weight of holding secrets from each other.

Manny has a serious conversation with Bode about a troubling discovery, urging him to be honest and take responsibility.

The Station 42 team responds to a dangerous zipline accident that escalates into a wildfire due to illegal fireworks; Sharon struggles with letting go of Vince's belongings and unexpectedly finds comfort in Vince's ex, Renee.

Station 42 faces a high-stakes wildfire situation that tests their unity, leadership and personal resilience; the new battalion chief is on site, but he has a polarizing leadership style that gets under everyone's skin.

In the aftermath of the Zabel Ridge fire, Station 42 faces internal turmoil but must rally together for a high-stakes rescue that tests their strength, loyalty and the future of the firehouse.