Ebirah, Horror of the Deep (1966)

In "Ebirah, Horror of the Deep" (1966), a group of individuals are stranded on an island and encounter the giant crustacean monster Ebirah. They also come across a terrorist organization and soon discover a secret base where they uncover plans for world domination. With the help of Godzilla, the group must find a way to stop the terrorists and defeat Ebirah before it's too late.