Men in Black follows the exploits of Agents K (Jones) and J (Smith), members of a top-secret organization established to monitor alien activity on Earth. The two MIB find themselves in the middle of a deadly plot by an intergalactic terrorist (Vincent D'Onofrio) who has arrived on Earth to assassinate two ambassadors from opposing galaxies. K and J face a simple imperative: track down the interloper or the Earth will be destroyed. It's all in a day's work for the Men in Black.