When exposure to a combination of radiation and insecticide causes Scott Carey to begin to shrink medical science is powerless to help him.

A retired San Francisco detective suffering from acrophobia investigates the strange activities of an old friend’s wife, all the while becoming dangerously obsessed with her.

A lone-wolf scientist sequestered in a mansion near a small desert town arouses the suspicion of the town’s doctor when his lab assistant is found dead from a case of acromegaly which took only four days to develop. As the doctor investigates, aided by the scientist’s new, and very female, assistant, they discover that, far worse, something much larger and hungrier than it ever should be, is devouring local cattle – and humans – in increasingly large quantities.

A glowing brain-like creature arrives on a beach near a rocket test site via a teleportation beam. The alien communicates telepathically with the children of scientists. The kids start doing the alien’s bidding as the adults try to find out what’s happening to their unruly offspring.