There have been many, many adaptations of the 1955 book The Body Snatchers. They range from the Excellent, the good, the average to mediocre, all the way down to the eye gouging terrible. Some of the installments in the franchise are interesting as a litmus test for what the people of the time are afraid of. The series is about Pod People taking over human bodies turning them into emotionless drones. While the people who realize what is happening try to warn everyone/fight the aliens.
If you look at the first adaptation from 1956, you see a picture of a society terrified of communism, The film was made at a time when people thought it was quite possible for your friends and family to be communist spies ready to take over the world, and so whether it was intentional or not that paranoia and fear bled over into the film. The film can also be seen as a comment on McCarthyism's attempts to homogenize the American public. The movie ended on a happy note due to pressure by the studio, but originally the film featured a much more pessimistic ending. The film as a whole was very atypical of the period and stands as a 50s classic.
Philip Kaufman directed the 1978 version. In my opinion this is the best adaptation yet made. It was released during the Vietnam War and Watergate; all the while The Cold War was making nuclear annihilation a constant threat. As such the movie is a dark deeply paranoid take on the story. When you watch it you can see this deep seething distrust of the government and organized institutions as a whole and Leonard Nimoy (SPOCK!) plays a parody of the self-help guru that had emerged in this era.
Like this except because in the film he was a pod person so emotionless, cold and stiff...You know what, exactly like this.
The 2007 version, that featured Nicole Kidman and Daniel Craig, was more effected by terrorism. And shared the dark paranoid vibe of Kaufman’s film. The movie ended in a bittersweet manner, with the Body Snatchers beaten, the film suggest that with all the violence, war and terrorism, we may have been better off as Pod People.
To understand why this movie has been made so many times, we have to attempt to understand why it scares us. The idea of losing that one thing that makes us people, that sets us apart from the masses our personality, scares us immensely; because in the end we are not what we look like, we are who we are.
Oh and sorry about the terrible Iron Man review.