Facing his anger management issues, Owen has a breakthrough in therapy. Then, after a particularly devastating emergency call, Grace reaches out to a co-worker, but regrets when Judd offers more than she was planning. Also, a clown has an emergency at a young boy's birthday party, and Tommy, T.K. and Nancy race to help a survivalist who has a painful encounter with a reptile.

Captain Strand and the 126 come together when one of their own is trapped after a building explosion. Meanwhile, Owen reflects on his 9/11 experience, T.K. and Carlos come to a decision and Tommy and Julius decide on their future.

An unexpected arctic cold front brings an ice storm to Austin and a variety of weather-related emergencies. Meanwhile, Owen deals with the fallout of the 126 closing, as Tommy, T.K. and Gillian settle into new employment, and Judd and Grace prepare for the birth of their first baby.

As the unexpected arctic cold front and ice storm continues to cause havoc in Austin, Owen works to rescue the lives of the stranded migrants; T.K.'s life hangs in the balance and Grace prepares for the birth of her baby.

Owen's first date with the beautiful and accomplished Chief of Staff to the governor of Texas goes awry. Meanwhile, the members of the 126 arrive at a house fire and find a couple's young daughter is missing. Then, Judd meets a teenager who has a profound impact on him.

Owen and the 126 race to the rescue when Catherine receives a package at the governor's office that may contain a bio-hazard. Meanwhile Grace and Carlos team up to investigate a prank 9-1-1 call that turns deadly.

The 126 respond to emergencies when a man falls into a trash compactor and a frantic mom tries to rescue her kids in a runaway car. Meanwhile, Tommy and Julius grow closer, as two team members disagree on keeping their romance a secret.

Grace is caught in the ice storm as she goes into labor, and Judd, Owen and Tommy race to find her.

In an attempt to bond with Wyatt, Owen and Judd take the teen alien hunting, but their search takes a different turn when they find two dead bodies. Meanwhile, Tommy joins a grief group for widowers, as mysterious events around her house lead her to believe Charles is communicating from the beyond with her and the twins. Then, a woman fears she is cursed and takes drastic measures to cure herself.

Owen is conflicted when his brother Robert asks him for help; Judd and Grace face a family crisis; As T.K. and Carlos prepare for their wedding day tragedy strikes.

A massive tornado sweeps through Austin, as Owen, Michelle and their teams race to save those in its path.

Grace and Judd fight for their lives in the aftermath of the horrific car accident, as flashbacks show how a childhood tragedy led Judd to meet Grace and how they ultimately fell in love.

A recovering Owen becomes the prime suspect in the serial arsonist case. Meanwhile, T.K. and Carlos find themselves in a fiery situation and Tommy gets the surprise of her life.

The crew race to a rattlesnake infestation, and attempt to rescue a man with dementia from a dangerous scene he created; Michelle learns the truth behind her sister's disappearance; A tragic accident shakes the crew to its core.

Owen and the 126 crew race to a gender reveal party gone horribly wrong, and a father/son trapped in a cave during a spelunking excursion. Meanwhile, Owen helps T.K. reconcile the past to help his future, Judd and Grace aid Judd's aging father.

Owen helps T.K. reconcile the past to help his future; Michelle learns the full truth about Iris.

Owen helps Tommy through a personal emergency.

When T.K.'s mother, Gwyn, has an emergency, Owen and T.K. travel to New York. But the flight is anything but smooth when the plane experiences a mechanical failure. Meanwhile T.K. reflects back when Gwyn helped get him into rehab years ago.

Owen and the 126 race to emergencies at a fast food drive-thru, a high school wrestling match and a case of road rage - all with one common element tying them together. Meanwhile, Tommy's estranged brother-in-law makes a surprise appearance in Austin, and Marjan confronts Capt. Strand about his anger management issues.

On her way back to Austin, Marjan is in for the fight of her life when she is targeted by a killer.

Grace and Carlos work together when they suspect a young woman was a victim of a black market organ trafficking ring; Owen's brother Robert comes to visit and meet T.K., but surprises Owen with news that can affect the Strand family.

Owen is conflicted when his brother Robert asks him for help; Judd and Grace face a family crisis; As T.K. and Carlos prepare for their wedding day tragedy strikes.

A bank robbery, an apartment fire and a pregnant woman lost in a parking garage are the seemingly unconnected calls to which the 126 responds. Then, T.K. celebrates his one-year anniversary of sobriety, while Owen and Gwyn may not make it to the end of the week as a couple. Also, Carlos finds himself working on a case with his Texas Ranger father.

Owen fears the past is back to haunt him when a stalker targets him and Catherine. Meanwhile, Tommy and Gillian face consequences when Gillian saves the life of a woman wearing a "Do Not Resuscitate" bracelet.

Emergencies include a ride-share trip gone awry, a farming accident and a memorial service that may turn into another funeral. Owen unexpectedly bonds with the former Captain of the 126 (guest star Billy Burke), while Marjan and the crew help Mateo try to pass his written exams.