The Earth is invaded by alien parasites—AKA 'slugs'—that ride on people's backs and control their minds.
Donald Sutherland
as Andrew Nivens
Eric Thal
as Sam Nivens
Julie Warner
as Mary Sefton
Keith David
as Alex Holland
Will Patton
as Dr. Lawrence Graves
Richard Belzer
as Neil Jarvis
Tom Mason
as President Douglas
Yaphet Kotto
as Ressler
Gerry Bamman
as Viscott
Sam Anderson
as Culbertson
J. Patrick McCormack
as Gidding
Marshall Bell
as General Morgan
