
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.

as Andrew Nivens

as Sam Nivens

as Mary Sefton

as Alex Holland

as Dr. Lawrence Graves

as Neil Jarvis

as President Douglas

as Ressler

as Viscott

as Culbertson

as Gidding

as General Morgan

as Greenberg

as Barnes

as Higgins

as Miss Haines

as Hawthorne

as Slugged Businessman (uncredited)

as Vince Hayward
