A marathoner falls in a canyon and breaks her pelvis while out on a training run with her dog, and the faithful canine searches for someone to rescue its injured owner.

A gunman holds a maternity ward hostage, seeking the doctor who performed a tubal ligation surgery on his wife two years earlier.

In the second season finale, college students get trapped when stacks of logs collapse during the construction of a massive bonfire at Texas A&M University.

A family encounters a blizzard while traveling from California to Idaho for a funeral, eventually embarking on a three day, 20 mile trek through the wilderness.

A car gets hit by a truck and dangles over a guardrail on a California highway, and rescuers try to save a mother and two daughters trapped inside.

A shoot-out involving a cop in Florida is the focus.

A woman who was in a cult with her family and was sexually abused as a teen by the cult leader is the focus. An international manhunt ensues to find the cult leader, who fled from Minnesota to Brazil.

A woman is beaten unconscious and put in an unheated storage locker by her ex-husband.

Some volatile young gunmen hold the people inside of an electronics store hostage and insist that their demands be met.

A tornado hits an elementary school in Oklahoma, and a teacher whose class was impacted shares her harrowing story in the second-season opener.

A family survives a plane crash that killed two in the Alaskan wilderness.

A grizzly bear attacks a father and daughter while they are hiking, and the dad safeguards his offspring.

An interstate bridge collapses in Minneapolis.

An Iowa farmer gets trapped in a grain bin as corn begins to suffocate him.

A nurse is abducted from her apartment by a man who forces her into his car and robs an auto-parts shop.