Synthetic Men of Mars (Martian Tales, No. 9)
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.
Author: Edgar Rice Burroughs
Binding: Mass Market Paperback
Publisher: Ballantine Books
Release Date: 1980-01-12