First appearance: War of the Worlds (1953)
As usual Mars decides to kill a bunch of people on Earth. Why? Probably because we're the closest inhabited planet. Or maybe they're just jerks. Either way they do a really good job of wrecking stuff. Will Earth's military or scientists figure out a way to stop this invasion?
The eventually remade this movie with Tom Cruise as the main character and in a weird twist decided that the martians had buried their war machines all over the surface of the Earth millions of years ago for some reason instead of sending them down in landing craft disguised as meteors like in every other version of the story.