Story: Boris the Animal (Jemaine Clement), the last of the Boglodite race, escapes with help from his girlfriend Lily (Nicole Scherzinger), from a prison on the Moon. He returns to Earth to exact vengeance on Agent K (Tommy Lee Jones), the agent responsible for his capture and the loss of his left arm. Agent K and his partner Agent J (Will Smith) are confronted by Boris, who withdraws but warns K that he is "already dead". Sensing a personal connection between K and Boris, J asks his partner about the alien criminal, but is turned aside. At MIB headquarters, J searches for information about the two, and learns that K is responsible for the deployment of the ArcNet, a defense system that protected Earth from invasion and ultimately led to the Boglodites' extinction.
That night, K vanishes from his apartment without a trace, and J finds himself in an alternate reality in which K was killed by Boris 40 years ago. The ArcNet is not in place, and a Boglodite invasion is imminent. J learns that Boris has traveled back in time to 1969, to help his past self kill K and prevent the ArcNet's deployment. J travels back in time to July 15, 1969, one day before K's death, in order to save his partner. He soon meets the 1969 version of Agent K (Josh Brolin), who initially mistrusts J and attempts toneuralyze him until J tells him the truth, leaving out that K is possibly going to die. The two follow a series of clues to an alien named Griffin (Michael Stuhlbarg), who has the ability to see multiple possible futures, at Andy Warhol's studio. Boris attacks, separating J and K from Griffin, but they rendezvous at Shea Stadium. Griffin attempts to give the two agents the ArcNet, in the form of a small disc-shaped device, but is kidnapped by Boris. J and K give pursuit on high-powered monocycles and manage to recover Griffin and the ArcNet, though Boris escapes.
J, K, and Griffin travel to Cape Canaveral, Florida, where the Apollo 11 rocket is preparing to lift off and land the first humans on the Moon. J and K race to attach the ArcNet to the rocket's tip, from which it can automatically deploy once in space. However, they are stopped by the local military police, commanded by an initially disbelieving colonel. Griffin uses his abilities to persuade the colonel to take them up to the rocket, though Griffin chooses to remain behind, as he says he is "no longer needed". Both versions of Boris attack the two agents at the top of the rocket's support structure. J is ultimately able to defeat future Boris using the time travel technology; he is knocked off the structure. K shoots off the left arm of the past version of Boris, and he too falls off the structure. K places the ArcNet and he and J escape from the rocket before it launches. Future Boris is incinerated by the rocket's exhaust. When the Apollo 11 lifts off in space the ArcNet detaches and activates successfully.
Past Boris ambushes K and the colonel, killing the colonel, and is then killed by K. A young child named James approaches the scene looking for his father, the colonel. Both K, who neuralyzes and comforts the child, and J, who is hiding nearby, realize that J was the child. J also realizes that K was his surrogate father, and that contrary to his beliefs when growing up, his real father died a hero. J returns to the present day, where K is still alive, and joins him at a diner, subtly thanking the older agent for all that he has done for him. A nearby Griffin assures himself that all is well.
Original Source: http://en.wikipedia.org/wiki/Men_in_Black_3

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