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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.

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This is book 9 of 15 in Barsoom. (standard series)

Preceded by Swords of Mars, and followed by Llana of Gathol.

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  1. Edgar Rice Burroughs (Author)

First Edition edit see section history

Original Language: English
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Publication Date: 1939
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Page Count: 315

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