Deep in outer space, Emperor Muge of the Empire of Death schemes his next conquest: the distant planet Earth. The emperor is the most formidable threat humanity has ever faced, especially after Shapiro Keats, a power‑hungry Earthling who has defected and become an imperial informant, joins his ranks. Muge’s indestructible robots crush army after army in a relentless onslaught. However, a small but determined team may still stand between Earth and total annihilation: ace pilot Shinobu, Sara (Shapiro’s former girlfriend), and the unlikely young hero Ryo. Together they command a newly developed weapon, forged in a secret laboratory deep beneath the earth’s surface, and must use it to turn the tide against the Empire of Death.