Barsoom series
The Mastermind of Mars is the sixth novel set upon the realm of Barsoom by author Edgar Rice Burroughs. The new hero in this book is the second to brave the red planet of Mars. American Ulysses Paxton becomes the chief assistant to the greatest scientist on Mars. Ras Thavas falls in love with Valla Dia, whose mind was transplanted to the ancient body of Xara. Vad Vara attempts to restore his love to her own body and faces a series of obstacles
...Synthetic Men of Mars is the ninth book of the Edgar Rice Burroughs Martian series, this book was featured in the newspaper Argosy Weekly in six parts released in early 1939. Dejah Thoris, princess of Helium, is badly injured in a deadly collision of two space crafts. Ras Thavas returns as the Mastermind of Mars.
Thavas creates a race of supermen on Mars that must be defeated before the entire planet faces a complete totalitarianism.
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