Film clips and interviews with biographers and colleagues chart the prolific, six-decade career of maverick actor-director Clint Eastwood.

On Aug. 21, 2015, the world watches in stunned silence as the media reports a thwarted terrorist attack on a train that's bound for Paris -- an attempt prevented by three young Americans traveling together through Europe. The heroic and courageous actions of Anthony Sadler, Alek Skarlatos and Spencer Stone help to save the lives of more than 500 passengers on board.

This reality competition sees teams embark on a trek around the world to amazing destinations where they must compete in a series of challenges, some mental and some physical. Only when the tasks are completed will they learn of their next location. Teams who are the farthest behind will gradually be eliminated as the contest progresses, with the first team to arrive at the final destination winning the race and the $1 million prize.