An expedition in the South Pacific lands on a tropical island where the natives worship the mysterious deity Gappa. An earthquake opens up an underground cavern and a baby reptile is discovered inside. The natives warn the foreigners to leave the hatching alone, but they don't listen and take it back to a zoo in Japan. Soon after, moma and papa Gappa start smashing Tokyo looking for their kidnapped child.
川地民夫
as Hiroshi Kurosaki
山本陽子
as Itoko Koyanagi
Yuji Okada
as Daize Tonooka
和田浩治
as Mashida
藤竜也
as George Inoue
Keisuke Inoue
as President Funazu
山田禅二
as Captain of the Kamome-maru
加原武門
as Elder
杉江廣太郎
as Reporter #1
弘松三郎
as Hosoda
Toshinosuke Nagao
as Cmdr. Riku
Masaru Kamiyama
as The Professor
