A warship that can navigate land, sea, and air becomes Japan's last defence against an ancient underwater civilisation bent on reclaiming the surface world.
Nuclear testing awakens a monstrous octopus of epic proportions near the Philippine Trench. On a rampage, the monster moves towards the North American Pacific Coast.
Three archaeologists uncover the sarcophagus of Princess Ananka despite being warned of a curse. The situation regresses when one of them awakens Kharis, who was entombed alive to guard the princess.