The Ultra Guard have reports of earthquakes in the area, but there's something strange about them. Meanwhile, two female racers on their way to a rally find an unusual rock just as another tremor shakes the ground near Aosawa Mountains. Moroboshi and the others seek out Dr. Iwamura to help investigate the peculiar quakes in the area. They also find the two girls. The strange rock cluster they found turns out to be Ultonium -- an element found at the Earth's core. The Ultra Guard then board the Magmalizer to burrow below the Earth's surface in the hopes of finding the answers behind the surge of earthquakes.
“ギラドラス、シャプレー星人登場”
ラリーの途中で道に迷った玲子と光子という女子大生が、山道で拾ったという石、それはウルトニウムという、核を形成している物質だった。早速、マグマライザーによる地中の捜索が開始されたが、マグマの中に突っ込んで動かなくなってしまう。
