The movie started out showing various candidates vying for a job with a secret agency in America. Will Smith plays the part of the actor that receives the job. He is called Agent K. He is teamed up with Agent J (Tommy Lee Jones.) The agency keeps peace and harmony on Earth amongst creatures from all planets in the solar system that have chosen to make Earth their home. These creatures reside undetected by humans on planet Earth. Some of the aliens pose as animals, some as humans. The main plot of the movie is that an alien lands on Earth trying to take possession of the universe which is hidden here. Another alien force insists that the universe must be turned over to them or the planet that houses the universe will be destroyed. Agents J and K must find the universe and return it to its rightful owner before that happens. During the search, Agents J and K encounter squabbles between intergalactic beings that must be handled diplomatically, a big ugly alien also looking for the universe who will stop at nothing to find the universe and remove it from Earth to take to his own people, and a pretty morgue doctor who helps them in their search.