When mankind faces an alien force with technology light years ahead of its own, will they be enough to save the Earth from destruction? The fate of humanity rests in the hands of the mysterious billionaire Sandman and a young band of orphaned misfits.

Sandman's units control the Gravion, a robotic deity forged of circuits and steel. But can his erstwhile pilots stop fighting amongst themselves long enough to fight the Zeravire? Or will the Earth be lost before the fight has even begun?

In Gravion Zwei, Sandman and his ragtag crew of misfits and loners are back at it again, only this time, they won't be the only ones on duty! Enter the elite G-Soldier Squadron, the first unit of the government's attempt to mass-produce Gravion technology. Led by ace pilot Faye, will the G-Soldiers push the Earthgertz gang out of a job?

Contains both Gravion and Gravion Zwei!