Super Human Challenge
Tim Fitzhigham meets the humans who defy science and puts their powers to the test - against himself.

Tim meets Dean Karnazes - a man who has run 350 miles without stopping and completed 50 marathons in 50 days, without breaking a sweat. But does Dean's extraordinary stamina make him a real-life Captain America? Tim challenges Dean to three super tests in order to prove, or disprove, these amazing super human powers.