Over ten days and 435 miles, an unbreakable bond forms between pro adventure racer Michael Light (portrayed by Mark Wahlberg) and a scrappy street dog companion named Arthur. Based on an extraordinary true story, ARTHUR THE KING follows Light, determined for one last shot at victory, as he persuades a sponsor to support him and a team of athletes (including Simu Liu, Nathalie Emmanuel, and Ali Suliman) for the Adventure Racing World Championship in the Dominican Republic. As the team faces extreme challenges in the race, Arthur teaches them the true meanings of victory, loyalty, and friendship.