The planet Zi and its ion-rich oceans gave birth to a large number of metal life forms. Some went on to become the humanoid Zoidians. Others became the creatures known as Zoids, mechanical living beings with a core as a central life-force. For centuries, the Zoidians lived in small tribes with an emphasis on survival, as their planet was wreaked with earthquakes and volcanoes. As the tectonic instability quieted down, their numbers grew, and people had time to squabble over territory. They took...