After successfully deploying its ultimate attack, Gravion manages to momentarily halt the Zeravire menace. Yet, as the threat reemerges abruptly, Earth Gult calls upon its ace, the super robot Gravion, to safeguard the planet once more. Meanwhile, the EFA devises a plan to craft a new arsenal, the Grand Trooper, to combat the Zeravire incursion. As they strive to repel the Zeravire assault, the inhabitants of Earth Gult and EFA must safeguard their future, confront their pasts, and unravel the enigmas surrounding the Zeravire.