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It has been 5 years since the alien-seeking agents averted an intergalactic disaster of epic proportions. Agent K (Tommy Lee Jones) has since returned to the comforts of civilian life as a small town's postmaster while Agent J (Will Smith) continues to work for the Men in Black, the self-funded New York City-based agency that secretly monitors and regulates extraterrestrial activity on Earth. J is largely without a partner, his former partner Agent L having returned to her former task as a mortician. While investigating a seemingly routine crime, J uncovers a diabolical plot by Serleena, a sadistic, shapeshifting Kylothian predator who disguises herself as a lingerie model. To circumvent her plans, J must convince K — who has no memory of his time spent with the agency, but is the only person alive who knows what is needed to defeat Serleena — to reunite with the MIB before Earth is destroyed.
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A large part of the plot is given to Agent J's relationship with a woman called Laura Vasquez (Rosario Dawson), a waitress at a SoHo pizzeria who happens to be a witness to Serleena's killing of the pizzeria's owner. Rather than erase her memory according to MIB rules, J allows her to retain it. As Laura becomes increasingly involved in the battle between Serleena and the MIB, she comes to view Agent J as her protector, while he simultaneously falls in love with her.
Ultimately, Laura's true identity is revealed as an extraterrestrial princess and power-source styled the "Light of Zartha". This revelation requires her to return to Zartha, her ancestral homeworld. Serleena, who has been seeking all along to find and possess the Light of Zartha, is killed just as Laura is transported away. Agent K is said to have had a romantic attachment to Laura's mother Laurana, after whom she is named, who was killed by Serleena twenty-five years before the film's story began; as a result, there is an implication that Agent K may be Laura's father, although this is never made explicit. When Laura has gone, K and Agent Zed (the acting head of MIB) attempt to console J for his loss, only to have him answer that he needs no consolation, having accepted her departure without much sorrow.
Two other plot threads relate the interaction of J with Frank the Pug (an extraterrestrial refugee posing as a pug dog, who becomes J's partner early in the film) and the revelation that K keeps a race of minuscule extra-terrestrials inside a storage locker at Grand Central Terminal, which locker encases their whole world. At the end of the film, K knocks open a forbidden door to reveal that a much larger locker located in a larger version of Grand Central Station contains the human world.
The film contains cultural references, including one to the popular joke that singer Michael Jackson is an extra-terrestrial; one to Oprah Winfrey, a philanthropist also implied to be so; another to the well-known idea that African-American drivers are more frequently arrested than European-American drivers on the road.
Info (c) http://en.wikipedia.org/wiki/Men_in_Black_II