They Live plot
"You see them on the street. You watch them on TV. You might even vote for one this fall. You think they're people just like you. You're wrong. Dead wrong."
John Nada mostly just wanders around the big city a bit, looking for a job. One day he accidentally finds a pair of sunglasses that allow him to see what some people really look like under their faces: they are aliens disguised as humans and they are planning to slowly take over the world. He'll have to stop them, but he's the only one who can see them. That is why John goes in search of the makers of these glasses to help them defeat the aliens.