They Live (1988)
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 is a quiet loner, a drifter who gets work where ever he can find it. While working on a construction site in L.A. and sleeping in a vagrant community at night, John stumbles upon a secret society of alien beings who pose as wealthy and powerful people in human society. John joins a rebel group commited to exposing this conspiracy, and becomes their reluctant leader and the only hope of the human race. The world looks a little different at the end of They Live, and one will never look at billboards, money, or sunglasses the same way again.