Edmond Hamilton 
Captain Future #12: The Comet Kings [EPUB ebook] 

Trapped in the depths of Halley’s Comet, the Futuremen battle fourth-dimensional monsters in a titanic struggle to save the system’s solar energy!
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.