Jonga and Krull had a routine job in the solar system defense organization. Week after week, year after year, they checked the asteroids. Suddenly a new asteroid appeared, and a survey expedition under Squadron Leader Masterson was sent out to investigate. The expedition failed to return, and when the watching observation corps made another anxious check, they found that the mysterious asteroid had disappeared as suddenly as it had come.
A second expedition was launched and found the wreckage of the first survey ships, and the bodies of every man except Masterson.
Where was the missing squadron leader? Who was the terrible, ageless asteroid man, so strong he could control the destiny of a planet? And what was a beautiful princess doing in the labyrinth below the surface of the asteroid?
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