The Masters had ruled all space with an unconquerable iron fist. But the Masters were gone. And this new, young race who came now to take their place-could they hope to defeat the ancient Enemy of All? Jarvis Hilton is in charge of a handpicked team of scientists -- and a navy warship on a deep space mission, dubbed Project Theta Orionis. On the outbound journey, automatic sensors drop their ship -- the Perseus -- into normal space for an encounter with a mysterious skeletal object. The encounter leaves them baffled, and leads them to a view an epic space battle. But strange as that is, it's nowhere near as mysterious as finding a planet covered in radioactive fuel ore -- and populated with humanoid robots who have been expecting their arrival and greet them as returning masters. . . !