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.
Tamio Kawachi
Hiroshi Kurosaki
Yōko Yamamoto
Itoko Koyanagi
Yuji Okada
Daize Tonooka
Kōji Wada
Mashida
Tatsuya Fuji
George Inoue
Keisuke Inoue
President Funazu
Zenji Yamada
Captain of the Kamome-maru
Bumon Kahara
Elder
