Gamera vs. Zigra

“Deep-Sea Monster Zigra!”

A moon base is wiped out by a spaceship from Zigra, and the visitors behind it have set their sights on Earth's oceans. Noriaki Yuasa sends Dr. Tom Wallace (Kōji Fujiyama) and Dr. Yosuke Ishikawa (Isamu Saeki) into a mystery they can barely follow, with a woman called Woman X (Eiko Yanami) at its center. Zigra wants the seas for its own ocean-dwelling people, and only Gamera stands between them and the planet.