With his tribe’s move to follow the migrating bison, Yakari, the little Sioux boy, sets out on his own to follow the trail of Little Thunder, a wild mustang said to be untameable. Travelling far from home and deep into the territory of the terrible cougarskins, Yakari and Little Thunder undertake a great adventure and find their way back home.

It’s the end of the world. A flood is coming. Luckily for Dave and his son Finny, a couple of clumsy Nestrians, an Ark has been built to save all animals. But as it turns out, Nestrians aren’t allowed. Sneaking on board with the involuntary help of Hazel and her daughter Leah, two Grymps, they think they’re safe. Until the curious kids fall off the Ark. Now Finny and Leah struggle to survive the flood and hungry predators and attempt to reach the top of a mountain, while Dave and Hazel must put aside their differences, turn the Ark around and save their kids. It’s definitely not going to be smooth sailing.