Alien Tornado

A small-town doctor learns that the population of his community is being replaced by emotionless alien duplicates.

After a fatal test shuts down their project, a disgraced team of scientists enters the criminal underworld to rebuild a forbidden space-bending engine that could rescue humanity or annihilate it entirely.

The residents of a small town are excited when a flaming meteor lands in the hills, until they discover it is the first of many transport devices from Mars bringing an army of invaders invincible to any man-made weapon, even the atomic bomb.

An alien and a robot land on Earth after World War II and tell mankind to be peaceful or face destruction.