In "Men in
Black 3," Agents J (Will Smith) and K (Tommy Lee Jones)
are back... in time. J has seen some inexplicable things
in his 15 years with the Men in Black, but nothing, not
even aliens, perplexes him as much as his wry, reticent
partner. But when K's life and the fate of the planet
are put at stake, Agent J will have to travel back in
time to put things right. J discovers that there are
secrets to the universe that K never told him -- secrets
that will reveal themselves as he teams up with the
young Agent K (Josh Brolin) to save his partner, the
agency, and the future of humankind.