Arthur the King is an upcoming American adventure film directed by Simon Cellan Jones, written by Michael Brandt, and starring Mark Wahlberg, Simu Liu, and Juliet Rylance. It is based on the 2016 non-fiction book Arthur - The Dog Who Crossed the Jungle to Find a Home by Mikael Lindnord. In the film, the captain of an adventure racing team befriends a wounded stray dog named Arthur, who accompanies the team on a grueling 435-mile (700-km) endurance race through the Dominican Republic.