Hayata, Fuji, and Satoru, the little brother of Fuji, have been captured by another alien seeking to seize Earth. However, this invader is far more powerful and intelligent than any before. While Ide, Arashi, and Muramatsu are left to deal with Fuji turned into a mindless giant and Hayata is paralyzed by the alien, Satoru is given the authority of handing Earth to the invader! (Source: TV Tropes)