Daikyoju Gappa or 'Gappa the Triphibian Monsters' -

release date	November 30 1966
studio	American International Pictures (AIP)
director	Haruyasu Noguchi
writer	Ryuzo Nakanishi, Gan Yamazaki
starring	Tamio Kawaji, Yoko Yamamoto, Yuji Okada, Koji Wada, Tatsuya Fuji
tagline	Even mightier than 'King Kong'!
trailer 1	Trailer #1

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Synopsis

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.