Kelly and Kai love to play on the gnarled old tree trunk outside their cottage in the woods. Sometimes it becomes a horse, sometimes a crocodile, and sometimes even a dragon. One day a mischievous gnome brings the tree trunk to life, and the children are whisked off to the Land of Long Ago on the back of the old tree dragon. On their incredible journey, Kelly and Kai meet a princess, rescue a knight, and trick the troll king. But will the old tree dragon stay alive long enough to bring them home again?