Mining engineer Shigeru investigates the disappearance and death of his fellow coworkers when prehistoric nymphs are discovered emerging from the mines. After an attack on the local village, Shigeru heads deeper into the mines only to make a more horrifying discovery in the form a prehistoric flying creature. Soon a second monster appears as the two converge in Fukuoka.
In 1976, a drifting star named Gorath is discovered to be on a collision course with Earth. Although it is smaller than Earth, its enormous mass is enough to destroy the planet totally. A mission sent to observe Gorath is destroyed after the ship is drawn into the star, with a later mission barely escaping the same fate. However, Astronaut Tatsuma Kanai is left in a catatonic state due to his near death experience. Unable to destroy the invading star, Earth's scientists undertake a desperate plan to build giant rockets at the South Pole to move the planet out of Gorath's path before it is too late.
Admiral Isoroku Yamamoto, a brilliant tactician, is a loyal subject of the emperor, despite his grave misgivings about leading Japan's navy into war with the United States. He opposes the attack on Pearl Harbor, but, overruled, he leads his forces to the best of his ability.
