In prehistoric times, within the quadrupedal tribe of primitive hunter-gatherers lives IGI, a young boy who ultimately becomes the first to stand upright in a society of stooped individuals. "No one stands like this," the New Chief declares, forcefully bending IGI back into the expected posture. Now, IGI faces a crucial choice: to conform and suppress his exceptional abilities, blending in with others, or to delve deeper into his gifts and risk exile from the only safe home he knows.