Synthetic Men of Mars (Martian Tales of Edgar Rice Burroughs)
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Synthetic Men of Mars (Martian Tales of Edgar Rice Burroughs)
John Carter desperately needed the aid of Barsoom's greatest scientist. But Ras Thavas was the prisoner of a nightmare army of his own creation -- half-humans who lived only for conquest. And in their hidden laboratory seethed a horror that could engulf all of Mars.