Thunder and Avalanche are two young kittens who love to explore the forest surrounding their home up along the western slope of the Rocky Mountains. In this adventure, the two friends meet a whole host of flora and fauna, traveling farther into the forest than they have ever been. While exploring, they encounter magpies and crows, bears, dogs, grasshoppers, butterflies, robins, and coyotes; ducks, elk, beavers, raccoons, mountain lions, and eagles; foxes, blackbirds, pocket mice, geese, hummingbirds and chickadees. The pair is tested as they make the discovery that they are humble prey as well as fierce predators, completing their first lesson on the Laws of Nature.