Joseph Samachson 
Captain Future #15: Worlds to Come [EPUB ebook] 

Captain Future and his valiant aides speed to the rescue of the Sagittarian system—ready to lock in mortal combat with deadly enemies from another 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.