Jay and kay return to provide the best against a sinister seductress who levels the toughest challenge yet for the MIB mission statement -- protecting Earth. It has been four years since the alien-seeking agents averted an intergalactic disaster of epic proportions. Now it is a race against the clock as Jay must convince Kay -- who not only has no memory of his own time with the MIB, but is the only living man left with the expertise to help save the galaxy -- to reunite with the MIB before the earth submits to ultimate destruction.