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The four remaining teams must navigate the dangerous terrain on top of a glacier.

The teams face the coldest night yet, and they must join forces to rappel down a cliff.

The remaining contestants must cross a rope suspended 100 feet over a gorge.

A helicopter takes the remaining teams to the base of a raging waterfall, which they must ascend.

Bear challenges the teams to swim to shore from the middle of a bay and navigate waterfalls.

The teams face some steep terrain, and high altitude takes its toll on a number of the challengers.

Bear welcomes a group of survival novices to face a series of arduous journeys.

Episode information will appear when available.

Episode information will appear when available.

Episode information will appear when available.

Episode information will appear when available.

Episode information will appear when available.

Episode information will appear when available.

Every year, planet earth is bombarded with tons of material from outer space. This amazing fact is most evident during spectacular displays of "falling stars," but most of the time it goes unnoticed. However, there have been accounts throughout history of strange discoveries after meteor showers. Some report a blood red rain; others have discovered blobs of an unknown gelatinous substance where the meteors supposedly fell. Stories and superstition have grown around these mysterious events. Today, scientists investigate the mystery using the latest tools and knowledge, and what they're discovering might prove some of the superstitions to be true.

From the deserts of Texas to the snowy valleys of Norway, mysterious lights have appeared without warning or explanation, and eyewitnesses express a mixture of fear and fascination for them. Many wonder if the lights could be ghosts, or visitors from outer space, but a team of researchers has a new theory on the origin of these strange lights.

In the mid 1990s in Puerto Rico, livestock were killed and appeared to have been drained of blood through puncture wounds to their necks. Eyewitnesses claim the creature responsible for the killings was an ugly creature that stood like a kangaroo with spikes running down its back, large fangs protruding from its mouth and large, predatory eyes glowing red. The case went cold until similar attacks by a different creature occur in Texas, and ranchers and farmers discovered the remains of this weird creature.

In New Jersey a teenage girl is killed and a psychic claims she can see her murderer. In Oregon, a psychic tries to help solve the slaying of a cowboy. Can psychics really help in police and government investigations? Skeptics say that while psychics may be sincere, theres no evidence to support their claims.

Across the planet thousands of crop circles have been reported.