 What doesn't the narrator believe Gorb to be?
My three staff men, Auchinleck, Stebbins and Ludlow, walked shieldwise in front of me. There was a lidless eye at the top of his head and five lidded ones, one above each arm. "Before we begin, I'll need certain information about—" "I am a being of Regulus II," came the grave, booming reply, even before I had picked up the blank. He was followed by a roly-poly blue-skinned humanoid from Donovan's Planet, four feet high and five hundred pounds heavy. Every alien wants to see Earth once in his lifetime, and there's only one way he can do it.
 a non-terrestrial
 a non-terrestrial  an Earthling  a hero  a con-man