Donald Stile is transported to the future by a Time Sphere where he finds two groups of giant brains (the good white brains and the evil black brains) battling—but what of the grey brain?

Variants

(1)
  1. “The Kingdom of Thought” by Lloyd Arthur Eshbach, in Amazing, August 1935.
  2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Lloyd Arthur Eshbach