Agent J needs help so he is sent to find Agent K and restore his memory.
For Agent J, it is another day at the office, monitoring, licening and policing all alien activity on Earth. One day, J receives a report of an unauthorized landing of an alien spacecraft near New York. It is an old enemy of MIB, a Kylothian named Surleena. Who is searching for a powerful artifact called The Light of Zartha. J investigates and quickly realizes he is going to need help. Unfortunately, the other MIB agents do not work up to par like J can. So, J decides to bring back K. J must bring back K's memory as an MIB agent and try to stop Surleena, before she can succeed.

 sequel about the Men in Black , Jay ( Will Smith play ) has grown as an experienced seasoned detective . In the case of a seemingly ordinary course of the investigation , the Jay case there is doubt . In-depth investigation revealed that the case bears a subversion of the Earth 's evil plans . This evil plan before making the pupa is played by Laura Fu Lin Bao children ( Lara Flynn, Boyle, ) alien Serena ( Serleena ) . Serena in order to achieve the purpose of its fight against the earth , transformed into a beautiful and sexy female models, mixed with the MIB Building, and to the safety of the whole building to blackmail . Destroyed Serena 's plot to rescue the trapped hostages are weak Detective Jay only go to the former partner Kay ( Tommy Lee Jones played) . MIB veteran Kay wash away the memory retired after serving in the U.S. postal system . Kay 's work at the post office themselves, and because the post office staff are all aliens , Kay's old acquaintances . Although the work is dull and monotonous , but this simple and easy day but it is his dream life . Kay enjoying the warmth of life with his wife and bit by bit, the alien conspiracy excites his sense of fighting . Jay Only by restoring Kay's memory , they can fight side by side , this trump card partner to come together and fight to defend Earth .
It is worth mentioning is also the film of the famous music Michael Jackson guest an aliens working in the Antarctic .