 The Thornberrys are in Mongolia for the Naadam Festival. The festival is held outdoors and features events such as horse racing, wrestling and archery. Eliza decides she wants to enter the horse racing contest and asks Marianne to help train her. Debbie becomes involved in the archery contest and Donnie enters the wrestling contest. Eliza picks a nice, reliable horse to ride but what she really wants is to ride one of the wild horses. But they are not reliable and she gets more than she bargained for when she mounts one.