In the movie Earth is invaded by Martians, who use devastating and seemingly indestructible machines to lay waste to cities. A group of scientists, led by "Dr. Clayton Forrester", frantically try to find a weakness of some kind in the marauding Martian machines, all while the military's efforts to stop the machines fail utterly. (no other spoilers)
This film has been released on Region 1 "Special Edition" DVD and can be seen for sale at Amazon by clicking the DVD cover art image above.
The trailer for the film: