When the big earthquake hits the Sierras, Oak''s mother is killed, and his father runs away. Oak, a young Bigfoot, had always been envious of his friend Chief Grey Claw''s tribe, the Tule. Feeling distraught and alone, he runs off to find a Bigfoot tribe. Despite the quakes bringing down the mountains, Jill and Horse set off to try to find Oak. What they find will change their world forever.