There's a new player in the game of Earth Defense. Enter the elite G-Soldier Squadron, the first of the government's attempts to mass-produce Gravion technology. Led by ace pilot Faye, will the G-Soldiers push the Earthgertz gang out of a job?

While facing a series of stepped up Zeravire attacks, Sandman decides his team needs some time off - at a hot springs resort.­ What better way to form a cohesive fighting unit than to see everyone in their skivvies? Towels fly and karaoke maids abound as the Gravion team battles a hidden danger deep within a nearby volcano.