Notable Zoidians include Fiona, Rease and Hiltz from Chaotic Century/Guardian Force. Numerous other Zoidians appear in the Zoids Battle Story. There is a striking similarity between the ancient Zoidians, and the ancient race in Zoids: Genesis. Both races had similar technological prowess, and both were left practically extinct due to some disaster. However, the ancient race in Genesis is not called Zoidians, and are not referenced as being natural inhabitants of Planet Zi.