While traveling with his father, young Alec becomes fascinated by a mysterious Arabian stallion who is brought on board and stabled in the ship he is sailing on. When it tragically sinks both he and the horse survive only to be stranded on a desert island. He befriends it, so when finally rescued, both return to his home where they soon meet Henry Dailey, a once-successful trainer. Together they begin training the stallion to race against the fastest horses in the world. Based on the book of the same name by Walter Farley.