Eu acho que são os Outer Limits, ou este:
(Na lista de episódios da Wikipedia )
Temporada 1, Episódio 9: "Corpus Earthling"
Gerd Oswald Orin Borsten (teleplay) and Louis Charbonneau (story)
Aired 8 November 1963
Parasitic aliens, with a plan to take over the human race, take refuge in a geologist's laboratory disguised as rocks. Although undetected by ordinary humans, one doctor (with an implanted metal plate in his skull) is able to "hear" the aliens communicate with each other while they discuss their plot. Although the doctor is unsure if what he hears is a delusion or not, the aliens see him as a threat and set out to kill him.
Ou este:
Season 2 Episode 6 "Cry of Silence"
Charles Haas Robert C. Dennis (teleplay), Louis Charbonneau (story)
Aired 24 October 1964
A city couple driving in the countryside makes a turn into a mysterious valley road where their car hits a rock and stops working. After the couple leaves their car, the wife has a slight accident in which she rolls downhill and sprains her ankle. When the husband reaches her, they realise they are being stalked...by tumbleweeds who appear to be possessed by some form of energy. At first they attempt to keep the tumbleweeds at bay with fire, but soon run out of firewood. At this point they are saved by a slightly disturbed farmer named Lamont, who explains that things have been awkward in the valley ever since a UFO landed two weeks before, causing his farm to die out. Lamont tells them he stayed merely out of curiosity, but now the weeds won't allow him to leave either. The three make their way to Lamont's house where they spend a frightening night surrounded by tumbleweeds first and then thousands of frogs. Comes morning, they walk back to the car without trouble, only to be attacked by living rocks once they get there. One rock kills Lamont. The couple runs back to the house, where the husband finally decides that the only way they are ever to leave there is to attempt to communicate with whatever is behind all this.