General Death Gaia commanded the Muge Zorbados Empire's initial invasion force occupying Earth. His early campaign crushed human military resistance through overwhelming firepower, heavily aided by the traitor Shapiro Keats' intelligence. This swift dominance relied on brute force and technological supremacy rather than intricate strategy.

Extremely arrogant and recklessly aggressive, Death Gaia consistently underestimated humanity's resilience and the rising threat of the Cyber Beast Force (Jyusenki Tai) and their transforming machines. His rigid tactics favored direct frontal assaults, lacking adaptability. This impulsiveness frequently disrupted fellow commanders' plans—especially Keats' complex schemes—as he pursued personal glory through impulsive actions.

As Cyber Beast pilots mastered their machines' dual animal/humanoid forms and combination abilities, Death Gaia's forces faced repeated defeats. His failure to counter the Jyusenki Tai's evolving power, particularly the Super Beast Machine God Dancouga, led to irreversible decline. After a decisive loss to Dancouga, Emperor Muge Zorbados stripped him of command. Acknowledging past service, the Emperor spared his life but reassigned him from frontline duty.

Death Gaia resurfaced in the OVA "Requiem for Victims," seizing control of the eldritch abomination mecha Zan-Gaioh for a vengeful redemption bid. In a final assault against Dancouga, he met ultimate destruction during combat with the Super Beast Machine God.

His leadership and failures contrasted sharply with successors Gildorome’s psychological warfare and Keats’ strategic cunning, exemplifying brute force’s limitations against determined resistance.