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En route to Tokyo during a violent storm, a cargo plane crash lands in the ocean and four passengers miraculously escape from death. They drift on a safety raft and enter a spaceship that is used to analyze and study alien civilizations. The four people avoid a mutated and growing microbe, except one, and finally try to communicate with the distant alien race owing to a computer. After being disinfected and studied, they're released. By chance, a plane rescue them. On board, they see the spaceship which goes back to its home place and self-destroys in the atmosphere.
Opening Narration: The persistence of Man's curiosity led him into new worlds. Without conquering his own, he invaded the sub-world of the microscope, and the outer-world of space. It is said turnabout is fair play... but is it?
Closing Narration: A few days, a week, a month... Will the Earth be visited by a stranger from the universe? A warm, compassionate stranger, to tell us of wonders beyond imagination, of life beyond comprehension, of secrets from the treasurehouse of stars?
Jefferson Rome: If I was assured that this creature isn't the alien who built this space probe. I'm sure now... But just look around, see how clean everything is.