When Martians that look like mysterious light creatures begin using Earth's space stations for their own nefarious purposes, some heroic astronauts set out to stop them before they reach our planet. But can the brave heroes possibly fight an enemy that isn't entirely visible? Do rayguns blast? Tony Russell, Jane Fate, Franco Nero star. AKA: "Gamma I Quadrilogy, Vol. 2." 97 min. Widescreen (Enhanced); Soundtrack: English Dolby Digital mono.