Gappa, the Triphibian Monster
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.
Top cast
Tamio KawachiHiroshi Kurosaki
Yōko YamamotoItoko Koyanagi- Yuji OkadaDaize Tonooka
Kōji WadaMashida
Tatsuya FujiGeorge Inoue- Keisuke InouePresident Funazu
Zenji YamadaCaptain of the Kamome-maru- Bumon KaharaElder
- Kōtarō SugieReporter #1
Saburo HiromatsuHosoda- Toshinosuke NagaoCmdr. Riku
- Masaru KamiyamaThe Professor
Below are the streaming services currently carrying the movie “Gappa, the Triphibian Monster” in the United States, along with how each offers it (subscription, buy, or rent) and a direct link. Licensing differs by market, so availability in the United States can differ from other countries.
Where to watch Gappa, the Triphibian Monster in United States
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Availability can change as licenses rotate — confirm on the provider’s page before subscribing. Last checked: 20 Sept 2026.