This is the story of Arthur, who walked out of the jungle one day and didn't stop walking until he found a home. The Adventure World Championship is a 430-mile race through the Amazon rainforest; one of the most gruelling endurance events on the planet. As Mikael Lindnord and his team collapsed one night, exhausted and starving, he noticed a scruffy but stoical stray dog out of the corner of his eye. Impressed by his bearing, Mikael threw the dog a meatball and thought nothing more of it.But when they left the next day, the dog came with them. Crossing rivers, climbing rocks, battling illness and injury, the team and the dog walked together towards the finish line, where Mikael decided he would keep Arthur (named after King Arthur) and take him back to his young family in Sweden, whatever it took. Their story is a testament to the remarkable lengths both humans and animals will go to: for success, for hope, and for love.