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In 1980, a giant planetoid named Gorath is discovered to be on a collision course with Earth. Even though it is smaller than Earth, its mass is huge enough to crush the Earth and destroy it. A mission sent to observe Gorath is destroyed after all the orbiting ships are drawn into the planetoid. A later mission is sent to observe and the crew barely leaves before suffering the same fate. However Astronaut Tatsuo Kanai is left in a catatonic state due to his near death experience. The Earth's scientists then come up with a desperate plan to build giant rockets at the South Pole to move Earth out of Gorath's path before it is too late.