Our friends from Frolix 8

"The world is run by an elite few, brains determining whether or not they are super-smart New Men, Unusuals with various psychic powers, or Undermen, performing menial jobs in an overpopulated world. Nick Appleton is an Underman, content to eke out an existence as a tire regroover. But after his son is classified an an Underman, Appleton begins to question the hierarchy. Strengthening his resolve, and energizing the resistance movement, is news that the great resistance leader Thors Provoni is returning from a trip to the farthest reaches of space. And he's brought help: a giant, indestructible alien."--Publisher description