来自外太空的奇特生物悄然入侵一个小镇，寄生在人类脊椎上，侵入大脑，使人丧失自主意志，成为它们的傀儡，帮助它们迅速扩散繁衍。探员Andrew、Sam与外星生物学家Mary联手消灭这些入侵者。
Donald Sutherland
Andrew Nivens
Eric Thal
Sam Nivens
Julie Warner
Mary Sefton
Keith David
Alex Holland
Will Patton
Dr. Lawrence Graves
Richard Belzer
Neil Jarvis
Tom Mason
President Douglas
Yaphet Kotto
Ressler
Gerry Bamman
Viscott
Sam Anderson
Culbertson
J. Patrick McCormack
Gidding
Marshall Bell
General Morgan
Nicholas Cascone
Greenberg
Bruce Jarchow
Barnes
