And it all began when prehistoric man discovered the art of communication..."A city couple driving in the countryside make a turn into a mysterious valley road where their car hits a rock and stops working.
At this point they are saved by a severely disturbed (possibly schizophrenic) farmer named Lamont, who explains that things have been awkward in the valley ever since a "meteor" landed two weeks before, causing his farm to be destroyed.
Lamont tells them he stayed merely out of curiosity, but now the possessed weeds, trees and rocks won't allow him to leave either.
The husband manages to make contact through self-hypnosis, and is briefly possessed by what appears to be a non-corporeal alien mind that came to Earth out of mere curiosity, but failed to establish communication.
The early scenes in this episode featuring the stranded couple menaced by sinister tumbleweeds bear a strong resemblance to Algernon Blackwood's well-known horror short story "The Willows".