Edmond Hamilton 
Captain Future #7: The Magician of Mars [EPUB ebook] 

Renegades from nine worlds crash out from interplanetary prison in a weird quest for phantom treasure. Follow the Futuremen as the greatest feud of all time catapults them into the fifth dimension.
The Captain Future saga follows the super-science pulp hero Curt Newton, along with his companions, The Futuremen: Grag the giant robot, Otho the android, and Simon Wright the living brain in a box. Together, they travel the solar system in series of classic pulp adventures, many of which written by the author of The Legion of Super-Heroes, Edmond Hamilton.