In 2015 in Costa Rica, while competing in the
Adventure Racing World Series, American runner Michael Light and his team get stuck on the first day after he makes the poor decision to
kayak against the tide. Team member Leo is outraged that Michael disregarded their opinions. In 2018, after a three-year lapse in his career, Michael is living in
Colorado Springs and not satisfied with himself. Married to Helen, who had been on the 2015 team, and working for his father Charlie's realty, he wants to feel fulfilled. Looking at the viral Instagram post of that failure, his 19th attempt to win the race, Helen encourages him to get a team together and seek a sponsor. So, Michael decides to race one more time with the hope of winning a race at last. He chooses two of his teammates: Olivia, a climber whose father made a career in the same discipline; and the older racer Chik, who had been dropped from a multi-winning Australian team due to a knee injury whose recovery is uncertain. However, his sponsor Broadrail offers half the money he asks for and imposes the fourth team member, Leo, who is now a social media celebrity, and whom Michael has not spoken to since the humiliating viral post. Against his own will, Michael accepts. Finding Leo in California, who is in a promotional photo shoot for his new line of clothing, Michael is forced into admitting his egocentricity cost them the 2015 race. He promises to listen to the team this time. The team flies from the USA to the Dominican Republic with only four days to acclimate and train for the 5-day race, as their sponsor would not invest more in them. 54 teams from 30 countries are competing against one another, and the route passes through mostly mountainous jungle terrain. Each team chooses their own route to each checkpoint, and Chik is their navigator. The over 400 mile route includes trekking, climbing, biking and kayaking. Just before the race begins, Olivia confesses that she's there for her dad, as he has little time left due to pancreatic cancer. So she, Chik and Michael are all in, as none believes they will try again. The first leg of the race is trekking. As they are resting and refueling themselves at the first transition camp, Michael gives meatballs to a stray dog. During stages 2 and 3, an almost 200 mile all-terrain section, they rock climb with their bikes strapped to their backs. Then, finding cables for zip lining, they decide to use them, again strapping their bikes to them. Chik and Leo make it without a hitch. However, Olivia's pulley gets stuck on a fraying cable, so Michael does a complicated maneuver that saves them both. At transition area 6, the halfway point, the team rests 35 minutes rather than the allotted hour. Now night-trekking in the jungle, they must deal with heavy rain. Leo starts to film them with his phone, as Michael sees he might again use it against them, he tosses it. An argument breaks out between them, Michael reveals he knew Chik's knee was not 100% and Leo that he does not believe they can win. The dog interrupts, barking, then later saves Leo and the Team from falling off a cliff so they all adopt him as one of them and call him Arthur, the King. For the last part of the competition, and while they are the race leader, they have to leave Arthur on shore to kayak on sea. But as they see the dog is about to drown while following them, they go back and save him. The team is thus delayed and loses the race, arriving second. Arthur collapses on arrival and a veterinarian finds he is severely infected by parasites, advising to put him down to prevent further suffering, which Michael refuses. He manages to take him to the USA, where the dog is saved. ==Cast==