From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Examine the environmental pressures that turned a wolflike creature that hunted in shallow waters into a leviathan of the seas.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Explore the planet’s most extreme season to explain the mysteries, dispel the misconceptions, and reveal the fascinating facts that make winter unique.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Scientists and paranormal detectives probe the minds of the haunted and dissect the most compelling evidence of ghosts.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Go inside the epicenter of the war in Afghanistan and meet the people who work in Camp Leatherneck, home to over 10,000 troops.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

A sweet Lab mix has a mysterious life-threatening problem, and if veterinarian Dr. Mike Dix can’t figure it out, Rosa could die.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

When animal control seized pit bulls from Michael Vick’s property, 22 of the most severe cases were sent to DogTown for rehab.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Travel to the Blue Moon and Aurelia — two worlds scientists believe could exist somewhere in the universe.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

CBP Officer McNamara stops a vehicle that reeks of gasoline and discovers a hidden compartment that could hold narcotics.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

DogTown takes on some of its biggest challenges yet — a street dog rescued from a war zone and terrier Katrina survivor.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

DogTown takes on some of its biggest challenges yet — a street dog rescued from a war zone and terrier Katrina survivor.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Warrior athletes are put to the test by science and cutting-edge technologies to exhibit their maximum capabilities.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Warrior athletes are put to the test by science and cutting-edge technologies to exhibit their maximum capabilities.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

It has no bones, blood, or brains, but the jellyfish has survived for more than 500 million years. Now, its numbers are exploding.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

It has no bones, blood, or brains, but the jellyfish has survived for more than 500 million years. Now, its numbers are exploding.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

A team of international scientists launch a high-tech forensic investigation to solve the mystery of King Tutankhamun’s death.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

In one year, 7 human feet in sneakers washed ashore in North America.What could be behind this macabre foot mystery?

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

In one year, 7 human feet in sneakers washed ashore in North America.What could be behind this macabre foot mystery?

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

NGC goes to the border to examine the growing tide of illegal activity that includes human trafficking and drug smuggling.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Japanese soldiers attack a small force of Americans with the goal of killing seven enemies each before they themselves are killed.

From: National Geographic Channel on Sat, May 07 2011 6:58 PM

Japanese soldiers attack a small force of Americans with the goal of killing seven enemies each before they themselves are killed.