A storm separates two brothers from a tribe no pony ever knew existed, nor did they know the others existed. Stonedust, a Mountain Pony colt, meets the Apple family and their friends after being carried far from home. Stormbreaker, his older brother, journeys to find him, though by coming into contact with The Crystal Empire, this adventure may be over quickly, but it's only the beginning for them and their tribe as they, too, discover the magic of friendship.