THE earth is being invaded by extraterrestrials again – for the third time this summer – as Hollywood explores one of its favorite themes anew in “Signs,” opening Friday. Fo… ...

Another low-key, unsung and genuinely scary alien movie, this 1989 gem (also known as “UFO Abduction”) is even more bone-chilling because it is done in the style of found footage.

We've noticed a trend in scary movie franchises: The fourth installment has a high chance of taking place in space (or, in the case of the "Friday the 13th"/"Jason" movies, the 10th installment).