If you are able to suspend disbelief about the protaganist being half alien to begin with, it's a neat concept. But the author isn't true to it. Kadar San winds up having the best of both worlds, able to use his alien abilities without suffering the consequences. The disembodied 'good' and 'evil' presences on the Dark Planet were kind of cheesy, too. But there's some good action. It held my attention to the end, even if it did turn out a little too pat.