distrusting the xiliens, ozaki, miyuki, and her sister, anna discovers that the gorath they saw is actually a hologram and that the aliens have replaced several members of the edf with duplicates. after their kind is exposed, the xiliens' controller, who called himself x during an interview on a radio show, kills his superior to assume command, revealing the plan to use humans as a food source while taking control of all the mutants except for ozaki through a property in their dna known "m-base". x also has the monsters placed under his control through m-base in their dna and awakens gigan to have them to wipe out the edf. the group escapes although gigan pursues them. gordon convinces them to travel to antarctica to release godzilla, which is immune to xilien control through its lack of m-base and easily destroys gigan. the "gotengo" then guides godzilla into battle with the other monsters and returns to tokyo to engage the xiliens. after penetrating the mothership, the group is captured and brought before x as he summons gorath to earth. though godzilla destroys gorath just before it crashes, it unleashes monster x, and the two monsters battle.