Synthetic Men of Mars Edgar Rice Burroughs Vol. 9 in his Mars-Series Looking for medical genius Ras Thavas to perform live-saving surgery on his beloved Princess, John Carter, Warlord of Mars, once more roams the Red Planet, only accompanied by the young Heliumite officer Vor Daj. They find Ras Thavas, and his incredible cloning experiments, and even find that he can transplant brains... and they find him and themselves prisoners of the experiments! DJV. Germany 2005