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Synthetic Men of Mars by Edgar Rice Burroughs

Book cover for Synthetic Men of Mars
In a vat on an island in the Toonolian Marshes, a grand experiment has gone awry. Ras Thavas, the Master Mind of Mars, has learned the secret of growing humans from a single cell, but now these invulnerable warriors have taken control and cloned an army to conquer the world. As John Carter and young warrior Vor Daj discover, the only thing worse than a monster that cannot die is a giant writhing mass of them - a grotesque mutation that will grow to consume everything in its path.