AllMovie

When a mysterious cone, 50-feet tall by 50-feet across at its base, is discovered sticking out of the ground near the town or Riverdale, IL, a group of investigators from Washington, D.C., are sent in to determine its origins. They discover that various townspeople have been murdered, while others, including the mayor, have disappeared; and when they reappear, they're under some form of outside control. The interior of the cone seems to violate every known law of physics and, from somewhere inside, there emerges a horde of hideous, insect-like creatures that attach themselves to human bodies for purposes of taking control. The team soon finds itself overwhelmed by thane increasing number of humans under alien control, and not even close to finding out what these creatures want or why they're here. The Brain Eaters was adapted without permission -- or the knowledge of distributor American International Pictures -- from Robert A. Heinlein's novel The Puppet Masters, and the makers were later forced to pay a settlement. The movie vanished from theaters but found a second life on television during the 1960s.