Edmond Hamilton 
Captain Future #4: The Triumph of Captain Future [EPUB ebook] 

Racing to the ringed planet in answer to Earth’s clarion call, the Wizard of Science seeks a forbidden elixir of life—and finds the City of Eternal Youth!
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.