As Capt. Owen Strand welcomes newcomer Captain Tommy Vega to the 126, he must face the unexpected arrival of his ex-wife, Gwyneth, who visits Austin to check on their firefighter son, T.K., following the injuries he sustained at the end of last season. All of this occurs as the rescue squad must deal with an emergency that the Texas capital has never encountered before.

The 126 is shut down and the crew is dispersed across the city. a massive and unexpected arctic front hits Austin with an ice storm, causing widespread chaos, Can Owen & Tommy not only save the city but find a way to resurrect and reunite the former 126?

Owen, Tommy and the rest of the 126 are being called into action to a county fair when a ‘derecho,’ a series of fast-moving group of severe thunderstorms, hit Austin, causing hurricane and tornado-force winds, heavy rains, flash floods and a wide path of destruction. And just when they think it couldn’t get worse, an even more rare weather phenomenon, a ‘heat burst,’ causing temperatures to go up to 122 degrees Fahrenheit, hits the city.

In this action-packed Final Season, Captains Strand and Vega, along with the 126 crew, face a deadly train derailment. Judd resigns to care for his disabled son, forcing Owen to choose a new lieutenant between Marjan and Paul. Tommy’s love life hits unexpected obstacles, while T.K. gets a surprise visitor on his 30th birthday that could change his and Carlos’ lives. As newlyweds, T.K. and Carlos face a tough test when Carlos becomes obsessed with solving his father’s murder.