A terrible drought has been hitting the vast prairies and the tribe is ready for migration to the Great Lakes of the North. There, the climate is cooler and water is in abundance. Under the hot sun, Yakari stumbles upon a formidable but harmless snake with a well-hidden secret, while at the same time, his trustful companion, Little Thunder, suffers from thirst and exhaustion. Will the mysterious rainbow-serpent help Yakari?
—Nick Riganas