A son's birthday present for his father turns a wilderness adventure into a life-or-death struggle against freezing weather and prowling grizzlies. A casual walk before work plunges a woman into a nightmare of raging rapids and swarms of insects.

A young woman races for rescue as her boyfriend is trapped and slowly dying in a freezing Utah river. A hiker faces a fork in an Oregon trail, and the choice he makes leads to a five-day struggle for survival.

A freak car accident leaves a man unable to move and fighting for his life, just a few hundred feet from a busy Houston highway. A skilled Florida hunter is out of his element, lost and alone in Alaska's punishing environment.

An adventurous young couple are pushed past their limits in a menacing Wyoming ice cave, with nothing but each other to protect them from freezing to death.

An ATV accident pins an experienced outdoorsman in the Canadian badlands, helpless and immobile as freezing temperatures and coyotes close in. A young woman out for a quick walk in Yosemite National Park takes a bad fall.

A marriage proposal on a Montana mountaintop turns into a life-or-death struggle against wind, rain and cold. A concussion leaves an experienced hiker lost and confused in the Washington wilderness.

A freak weather system strands two sailors on a lifeless Mexican desert island with no food or water and staving off death by exposure. A hiker with a broken femur fights for his life in the middle of Joshua Tree National Park's punishing heat.

Three teenagers find themselves stranded on a remote northern Canadian island for three weeks, facing death by starvation as winter closes in. A quick hike in Utah's Bryce Canyon suddenly turns into a four-day struggle for survival.