an upgraded gigan aids monster x but is intercepted by mothra, who is gravely wounded while managing to destroy the cyborg. in the xilien ship, x reveals that both he and ozaki are superior beings known as "keizers", powerful beings distinct from regular mutants born on rare occasions when human dna and m-base are combined, before directly taking control of ozaki to turn him against the group. a fight breaks out, and x loses control of ozaki due to the shobijins' blessing. x is fatally wounded, but he triggers the ship's self-destruct as the group falls back to the "gotengo" moments before the mothership explodes. godzilla and monster x continue their battle as the latter transforms into its true form, keizer ghidorah. keizer ghidorah initially gets the upper-hand but godzilla emerges victorious in the end. minilla shows up at the scene and convinces godzilla not to destroy the "gotengo". the survivors watch godzilla and minilla return to the ocean.