The Brain Eaters 1958

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