Edmond Hamilton 
Captain Future and the Space Emperor [EPUB ebook] 

President Carthew was in his office when the monster appeared — a giant, hunched creature, bizarrely hideous…The President gaped as a guard appeared in the doorway and pointed his weapon at the fanged being."Don’t shoot!" Carthew cried, but too late. The beast lay dead on the floor.Carthew sighed deeply as he confirmed his fears. The corpse on the floor was Sperling, his best secret agent, transformed into this hairy brute by the dread peril that threatened to destroy them all.Only one man left alive might be able to ward of off total doom. The President flashed an emergency call for Captain Future…