The ancient world was filled with restless spirits and powerful forces. 2 million years ago, human evolution made its move. It chose Fire. At the dawn of humanity, during a period of tremendous change and drought, three lost children meet a mysterious traveler named Tuki. Together, their search for the Motherherd of all Buffalo leads them far north through the dangerous territory of a rival species called the Habiline. The Habiline hunt and kill anyone...

The adventure starts when cousins Fone Bone, Phoney Bone, and Smiley Bone are run out of Boneville and later get separated and lost in the wilderness, meeting monsters and making friends as they attempt to return home.