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.

Jay and Kay are back as two highly secretive, highly funded and highly unofficial government agents dealing with all things evil and alien -- including "outing" aliens living among us. Kay now works as a mailman, but when a dangerous alien disguised as an irresistible model threatens Earth, Jay gets Kay out of retirement to save humanity once again.

On a top-secret mission, J, a charismatic New York City cop, teams up with K, a seasoned government agent who monitors aliens on Earth, to stop intergalactic alien terrorist Edgar from inciting an interstellar, humanity-destroying war.