Duke and Sami, the ranch dogs, with their family and friends of River Ranch are back again. This time fighting evil in the form of an ancient Native American medicine man (Shaman). The Shaman has kidnapped his tribe's chief's son and in hiding in one of the caves on Mystery Mountain has inadvertently traveled through time to the present. Pursued by the chief, Running Bear and his friend Kretus, the leader of the Wolfen pack, they land on Mystery Mountain and seek the help of Duke and Sami in finding the Shaman and rescuing the boy With many events happening around them at River Ranch, can Duke and Sami, with their special powers and help of some of their animal friends save the boy and destroy, once and for all, the evil that exists in the form of Cheyevo, the Shaman?