Invasion of the Body Snatchers, 1956

"In my practice, I've seen how people have allowed their humanity to drain away. Only it happened slowly instead of all at once. They didn't seem to mind...All of us - a little bit - we harden our hearts, grow callous. Only when we have to fight to stay human do we realize how precious it is to us, how dear." Dr. Miles J. Bennell

This movie has a theme that pops up in science fiction thriller type movies: Earth is invaded, usually by creatures from outer space. Although monstrous the creatures are able to assume a human guise in order live among Earthlings without detection. The invaders purpose is generally the domination of Earth although they sometimes just want to study us. Usually one person knows the frightening truth. But in trying to reveal the truth that character at best discredits himself. At the worst, he is put into a straight jacket. For the truth is always too fantastical to be believed. The "good guy" is usually alone in his struggles; betrayed by those closest to him. Few things could be more horrifying than looking into the familiar eyes of a loved one only to discover an alien enemy.

Keven McCarthy plays Dr. Miles J. Bennell. He is the guy who is wise to the situation; trying to be believed while running from aliens.
Dana Wynter plays Becky Driscoll; his ankle twisting female interest. She was the one person Dr. Bennell trusted; the only other person whose body had not been "snatched".

"Invasion of the Body Snatchers" lives up the the name "thriller". It digs down into that lower part of my brain, past reason, and strikes a cord of fear. It never fails to give me goosebumps. I first saw "Invasion of the Body Snatchers" in a movie theater. It was the 1978 version with Donald Sutherland.
Walking home I noticed other people on the sidewalks walked wooden legged, vacant eyed. They did not talk to one another. (I am sure that is what I saw!) The street lights cast lurid shadows on all their faces. Horrible!

Homer: "I suppose you want to probe me. Well, might as well get it over with. unzips pants.."
Kang: "Stop!! We have reached the limits of what rectal probing can teach us."
The Simpsons "Tree House of Horror VII".