Set in a former mining village in Wales, "Dark Horse" is the inspirational true story of a group of friends from a working men's club who decide to take on the elite 'sport of kings' and breed themselves a racehorse. Raised on a slagheap allotment, their foal grows into an unlikely champion, beating the finest thoroughbreds in the land, before suffering a near fatal accident. Nursed back to health by the love of his owners - for whom he's become a source of inspiration and hope - he makes a remarkable recovery, returning to the track for a heart-stopping comeback.