Acting as a special correspondent for the Daily News, Jun travels to Japan's base at the South Pole. Once there, he learns about the mysterious disappearance of staff member Nomura three years ago, an incident that is made more intriguing by a passage in Nomura's journal which refers to the unknown entity, "Peguila". Yoko Kuhara, staff physician and Nomura's fiance, is also stationed at the base and remains optimistic that they will find the missing Nomura. Soon, strange disturbances begin to take place, as well as a dramatic drop in the region's temperature.

A mysterious lifeform adheres to the rocketship Saturn I on its return trip following the exploration of Saturn. The alien creature absorbs the rocket's energy, causing it to crash into the sea upon re-entry into Earth's atmosphere.

At a Tokyo airport, a sudden, mysterious cold wave causes an aircraft to crash and grounds the other planes. A strange black cloud descends on Tokyo and from within it, emerges the monster Peguila.

Under the cover of night, a mysterious man steals the Tilsonite rock from Tokyo's Astrophysics Research Institute. When a group of meteors is detected approaching the Earth, Jun and the others fear that an invasion from outer space is once again imminent.

Jun and Yuriko travel to the island of Iwanejima to investigate undersea volcanic activity. A young marine geologist, Dr. Ishii, has theorized that the entire island may soon be in danger of submerging beneath the sea.

Following the destruction of a fishing vessel by a gigantic octopus, the lone survivor named Yuzo, the son of the ship's captain, is washed ashore nearby Compass Island. He is rescued and cared for by the beautiful native girl, Anita and the two begin to develop affections for one another.

A ring of smugglers, including a mysterious woman named Aleen, steal a rare statue and kidnap a young girl named Tami in the process.