Yakari the little Sioux boy sets out on his own to follow the trail of Little Thunder, a wild mustang said to be untamable. On his journey and alone for the first time in his life, Yakari is visited by Great Eagle his totem animal who gives him a magnificent feather as well as the incredible ability to speak to animals. Travelling far from home and deep into the territory of the terrible puma skin clad hunters, Yakari and Little Thunder undertake a great adventure. Their journey, through breathtaking but treacherous landscape, will forever seal the undying friendship between the bravest little Sioux boy and the pony who runs like the wind.