The Earth is invaded by stingray-shaped alien "slugs" that ride on people's backs and control their minds.
- Stuart Orme
- Robert A. Heinlein
- Ted Elliott
- Hollywood Pictures
Strange aliens land in the Midwest, taking over people's minds in order to spread their dominion. Sam Nivens and Andrew Nivens, aided by Mary Sefton, are part of a government agency who must stop the the aliens before the aliens get to them...