Edmond Hamilton 
Captain Future #2: Calling Captain Future [EPUB ebook] 

Curtis Newton, wizard of science, and his trio of Futuremen blaze a trail across the stars to forestall the coup of Dr. Zarro—leader of a legion of peril!
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.