1958 science fiction-horror film about alien parasites who invade the small Illinois town of Riverdale and are able to take over any living thing, mind and body, by attaching themselves to their host's back and inserting two mandibles into the base of their spines. The parasites are discovered by a team of local scientists who have been studying a mysterious, three-story-tall, cone-shaped object which appears to have crashed outside the town from some place in outer space. It quickly becomes obvious that the first victims of the parasites are being deliberately directed to infect the town's leading citizens. Next in line were communication functionaries where citizens were given additional parasites so that the town can become a facilitation point for spreading further parasites across the country. The film was directed by Bruno VeSota and stars Ed Nelson, Alan Frost, Joanna Lee, with a brief appearance by Leonard Nimoy (name misspelled in 10th place in the credits as "Leonard Nemoy").