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Beginning fairly early after the start of the original Japanese Zoid releases, the battle story first introduced the conflict between two rival nations: the Helic Republic and Zenebas Empire.

Their main weapons were Zoids, living war machines built from metal-based lifeforms native to planet Zi.

The Zenebas Zoids were mostly red and silver and more armored, the Helic more skeletal and favoring blue and grey.