Over the course of ten days and 435 miles, an unbreakable bond is forged between pro adventure racer Michael Light and a scrappy street dog companion dubbed Arthur. As the team is pushed to their outer limits of endurance in the race, Arthur redefines what victory, loyalty and friendship truly mean.

Mark Wahlberg

Michael

Simu Liu

Leo

Juliet Rylance

Helen

Nathalie Emmanuel

Olivia

Ali Suliman

Chik

Bear Grylls

Himself

Paul Guilfoyle

Charlie

Rob Collins

Decker

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