The Midwest USA is invaded by stingray-shaped alien slugs that ride on people's backs and control their minds in order to spread their dominion. Government agency reps Sam Givens, Andrew Nivens, and Mary Sefton must stop the aliens.
Andrew Nivens
Sam Nivens
Mary Sefton
Alex Holland
Dr. Lawrence Graves
Neil Jarvis
President Douglas
Ressler
Viscott
Culbertson
Gidding
General Morgan
Greenberg
Barnes
Higgins
Miss Haines
Hawthorne
Slugged Businessman (uncredited)
Vince Hayward
