Gappa, the Triphibian Monster (1967)

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.

Gappa, the Triphibian Monster is an action movie featuring Tamio Kawachi and directed by Haruyasu Noguchi.

Gappa, the Triphibian Monster is currently streaming for free (ad-supported) on Cineverse, Tubi TV and VUDU Free and it's also available on AsianCrush, Classix, FlixFling, IndieFlix and Midnight Pulp.

It is also possible to buy Gappa, the Triphibian Monster on Amazon Video, FlixFling and Vudu.