The 126 are called to a county fair when a series of severe thunderstorms hit Austin. Owen's newfound motorcycling passion puts him on a potentially dangerous path.

The 126 race to rescue a woman trapped in her mobile home that is hijacked by her ex. Owen encounters his former nemesis, Sgt. O'Brien, and is then questioned by the FBI. T.K. and Carlos meet with Iris Blake.

Owen gets pulled deeper into the FBI's investigation of the motorcycle gang. The 126 respond to a call from a man who claims his girlfriend slipped over a cliff side. Carlos searches for a missing friend.

As Owen wears an FBI wire for his meeting with O'Brien, The Honor Dogs crash the meet-up and let them know there's an infiltrator in their midst. A frantic TK desperately searches for a held captive Carlos.

Owen helps defend Marjan when a rescue complaint forces her to make a challenging ethical decision; Grace befriends a young boy who becomes a frequent 9-1-1 caller, but when she discovers he may be in some real danger she must step in.

Owen reveals to the 126 he has been working with the FBI to help bring down a domestic terrorist group with his motorcycle gang. Then the 126 respond to a bomb threat at the State Capitol and put a stop to the terrorist deadly plans.

The 126 help a husband whose wife "dies" when she is not upside down. A pizza delivery driver gets the shock of his life. Tommy meets her match when Trevor's daughter becomes her rival.

The 126 must rescue a father/son involved in a driver's ed lesson gone haywire. Owen turns into a "Dadzilla" in helping plan T.K. and Carlos' wedding. Marjan is suspicious when she meets a couple on her road trip.

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

Tommy goes paramedic crew-to-crew against her former employer, private contractors Paragon Medics. Owen hits it off with a beautiful woman he meets at a fundraiser.

The 126 race to rescue a woman with an arrow shot into her head. Judd is doubly surprised by news Wyatt shares. Mateo helps a family member in need and comes to regret it.

When she discovers her former fiancé is having a baby, the 126 help Marjan enter the dating world. The team is called to the rescue when a pregnant woman takes her anger out at a motel where she suspects her husband is cheating.

Owen is shocked by a secret Kendra has been keeping from him. Grace confronts her father about his past infidelity.

Owen enlists Paul's help in proving Kendra's innocence. Tommy deals with church gossipers over her relationship with Pastor Trevor.

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.

When Tommy and Judd disagree on protocol during a rescue at paper mill, a full-on feud develops between the 126 EMS and Fire. Owen awaits news that could change his and T.K.'s lives forever.

Carlos's father tries to recruit him to the Rangers, causing a rift to form between the two. Meanwhile, Judd deals with his feelings surrounding Wyatt's accident.

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.