In the third season of Boundless, newcomers Rory Bosio and Hunter McIntyre join Simon Donato and Paul "Turbo" Trebilcock as they trek across seven countries and three continents competing against each other, in pairs or as a group in extreme endurance races. Pushing their minds and bodies to the limits, the squad races against stunning backdrops of exotic locales that are enticing to the senses but camouflage the demands of the arduous terrain. From running, biking, skiing, swimming and climbing, their love for the rush coupled with their undeniable stamina makes it a wild ride with a few cuts and bruised egos along the way. Will the pure passion for the sport take them across the finish line or will they tap out when their minds can't push their bodies any further?