Followed by a cameraman, adventurer Bear Grylls uses his military training and daring spirit to demonstrate extreme survival skills - everything from traversing through alligator-infested swamps and scaling hundred-foot cliffs, to scavenging for and eating raw insects and many other delicacies.  In MAN VS. WILD's fourth season, which debuted August 12, Bear Grylls comes face to face with extreme danger, unlike ever before, as he leads viewers through remote locations, including the Arctic Circle, Alabama, the jungles of Vietnam, Alaska, and Texas, sharing invaluable survival strategies all along the way.  Prior to production, Bear meets with local experts, guides and rangers and shares the knowledge he gains with viewers through action in the extreme climates.