Tommy Lee Jones and Will Smith are Immigration officers but the illegal aliens these government employees are after come from a little further away then Mexico. A lot further. The posters say their job is to protect the earth from the scum of the universe. But they get to do some other fun stuff too. Look cool. Be funny. Play with cool alien fighting gadgets. Let's just say they are good at their job. You may be surprised to find who comes from another planet in our Tribute to Men in Black.