
A huge, alien structure resembling an inverted cone, appears in the woods outside a small rural town. Sent from Washington to investigate the origin of the mysterious object, a team of investigators discovers that intelligent parasites from inside the "cone" can attach themselves to humans' nervous systems and control their minds, taking control of the authorities and workers, making communication with the outside world impossible, and leaving the responsibility of stopping the invasion up to seven people who have thus far been able to avoid possession by these creatures from parts unknown.
Cast

Ed Nelson
Dr. Paul Kettering
Joanna Lee
Alice Summers

Cornelius Keefe
Senator Walter K. Powers
Alan Jay Factor
Glenn Cameron

Jody Fair
Elaine Cameron
David Hughes
Dr. Wyler
Robert Ball
Dan Walker

Phil Posner
Sheriff

Orville Sherman
Mayor Cameron
Henry Randolph
Telegrapher

Hampton Fancher
Zombie (uncredited)

Leonard Nimoy
Professor Cole
Doug Banks
Doctor
Saul Bronson
Prof. Helsingman
Crew

Bruno VeSota
Director
Gordon Urquhart
Screenplay
Carlo Lodato
Editor
Lawrence Raimond
Director of Photography
Mike Murphy
Assistant Director

Roger Corman
Executive Producer

Ed Nelson
Producer
Stanley Bickman
Associate Producer
Alan Trumble
Makeup Artist
James Fullerton
Sound
Tom Jonson
Original Music Composer
F. Amos Powell
Production Manager
Burt Shonberg
Art Direction
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