Not every alien is trying to invade Earth, but if you're looking for the thrills and danger of an alien invasion, you can't go wrong with these titles.

Steven Spielberg said he believes it is “mathematically and scientifically impossible” that alien life does not exist beyond Earth while promoting his upcoming UFO thriller “Disclosure Day.”

Ridley Scott’s Alien, James Cameron’s Aliens, and Alien 3 form a sci-fi horror trilogy starring Ellen Ripley, spanning terror, action, and survival.

Most alien invasion movies play out the exact same way. Some human beings are going about their lives, spaceships arrive, they blow things up, humans fight back, and save the day. The end. That's not always a bad thing, though. There's something satisfying ...