A scientist trains a man with an advanced telepathic ability called 'scanning' to stop a dangerous Scanner with extraordinary psychic powers from waging war against non-Scanners.

One strain of horror depends on things unseen or half hinted at, but the chilly Canadian preferred the sort of monstrosities that had to be seen to be believed—like the aphrodisiac mind-controlling slugs of Shivers, the penile armpit
By Kim Newman
Criterion Channel