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第 季第 4 集1 - Southwest Qualifying Round Part 1
2012年5月19日38 分鐘Athletes across the Southwest get their first chance to take on the World's Most Difficult Obstacle Course.權限已過期，無法觀看此影片第 季第 4 集2 - Southwest Qualifying Round Part 2
2012年5月19日38 分鐘Athletes across the Southwest compete for a chance to take on the World's Most Difficult Obstacle Course.權限已過期，無法觀看此影片第 季第 4 集3 - Southwest Regional Finals
2012年5月20日1 小時 19 分鐘The top 30 finishers from the Southwest region preliminary round compete to move into the finals權限已過期，無法觀看此影片第 季第 4 集4 - Midwest Regional Qualifying Round Part 1
2012年5月26日38 分鐘Athletes across the Midwest compete to take on the World's Most Difficult Obstacle course權限已過期，無法觀看此影片第 季第 4 集5 - Midwest Regional Qualifying Round Part 2
2012年5月26日41 分鐘Athletes across the Midwest compete to take on the World's Most Difficult Obstacle course權限已過期，無法觀看此影片第 季第 4 集6 - Midwest Regional Finals
2012年5月26日40 分鐘The top 30 finishers from the Midwest region preliminary round compete for the chance to move into the national finals in Vegas.權限已過期，無法觀看此影片第 季第 4 集7 - Northeast Regional Qualifying Rounds Part 1
2012年5月26日37 分鐘Athletes across the Northeast compete to take on the World's Most Difficult Obstacle course權限已過期，無法觀看此影片第 季第 4 集8 - Northeast Regional Qualifying Rounds Part 2
2012年5月26日38 分鐘Athletes across the Northeast continue to compete for a chance to take on the World's Most Difficult Obstacle Course. However, only 30 will move on to the Northeast regional finals--and so far only eight have defeated all of the obstacles in Miami, Florida.權限已過期，無法觀看此影片第 季第 4 集9 - Northeast Regional Finals
2012年6月3日41 分鐘The top 30 finishers from the Northeast region preliminary round take on an even more challenging course to lock a spot in the Vegas finals.權限已過期，無法觀看此影片第 季第 4 集10 - Northwest Regional Qualifying Round Part 1
2012年5月26日38 分鐘Aspiring ninjas across the Northwest land on Venice Beach to compete for a chance to tackle the World's Most Difficult Obstacle Course. Only 30 will move on to the Northwest regional finals, but first they will have to tackle a new obstacle unique to this region--the strength and balance-testing pipe slider! Will David Campbell, who went further than any American in history last year at Mount Midoriyama, get another shot at the title? Or will diabetic-turned-athlete Kyle Cochran be the standout rookie who moves on? Find out!權限已過期，無法觀看此影片第 季第 4 集11 - Northwest Regional Qualifying Round Part 2
2012年5月26日40 分鐘Athletes across the Northwest continue to battle it out for the Northwest regional finals.權限已過期，無法觀看此影片第 季第 4 集12 - Northwest Regional Finals
2012年6月11日39 分鐘The coast-to-coast search continues as the top thirty competitors from the Northwest preliminary round are narrowed down to just fifteen.權限已過期，無法觀看此影片第 季第 4 集13 - Midsouth Regional Qualifying Round Part 1
2012年5月26日38 分鐘Athletes across the Midsouth gather to compete for a chance to take on the World's Most Difficult Obstacle Course.權限已過期，無法觀看此影片第 季第 4 集14 - Midsouth Regional Qualifying Round Part 2
2012年5月26日39 分鐘Athletes across the Midsouth continue to compete for a chance to take on the World's Most Difficult Obstacle Course權限已過期，無法觀看此影片第 季第 4 集15 - Midsouth Regional Finals
2012年6月18日1 小時 17 分鐘The top 30 finishers from the Midsouth region preliminary round compete for the chance to move into the national finals in Las Vegas.權限已過期，無法觀看此影片第 季第 4 集16 - Southeast Regional Qualifying Round Part 1
2012年6月23日38 分鐘Athletes across the Southeast compete to take on the World's Most Difficult Obstacle Course權限已過期，無法觀看此影片第 季第 4 集17 - Southeast Regional Qualifying Round Part 2
2012年6月23日39 分鐘Athletes across the Southeast continue to compete to take on the World's Most Difficult Obstacle Course.權限已過期，無法觀看此影片第 季第 4 集18 - Southeast Regional Finals
2012年6月24日40 分鐘The top 30 finishers from the Southeast region preliminary round compete for a spot in the finals.權限已過期，無法觀看此影片第 季第 4 集19 - Las Vegas Finals Part One
2012年7月7日40 分鐘The finals begin as 100 competitors take on Stage 1 of the World's Most Difficult Obstacle Course.權限已過期，無法觀看此影片第 季第 4 集20 - Las Vegas Finals Part Two
2012年7月7日39 分鐘The finals continue as 100 competitors take on Stage 1 of the World's Most Difficult Obstacle Course.權限已過期，無法觀看此影片第 季第 4 集21 - Las Vegas Finals Part Three
2012年7月7日40 分鐘The finals continue as competitors take on the challenge of Stage 1 of the World's Most Difficult Obstacle Course.權限已過期，無法觀看此影片第 季第 4 集22 - Las Vegas Finals Part Four
2012年7月9日40 分鐘Competitors continue to take on Stage 1 of the punishing obstacle course in Las Vegas.權限已過期，無法觀看此影片第 季第 4 集23 - Las Vegas Finals Part Five
2012年7月15日36 分鐘As Stage 1 comes to a close, eighteen challengers attempt to clear eight grueling obstacles including the Step Slider, Giant Swing and the Spinning Bridge.權限已過期，無法觀看此影片第 季第 4 集24 - Las Vegas Finals Part Six
2012年7月23日1 小時 14 分鐘Top finishers tackle the four stage obstacle course modeled after the famed Mount Midoriyama in Japan.權限已過期，無法觀看此影片
