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Men in Black 3 (Men in Black³)
In 2012, alien criminal Boris the Animal escapes from a maximum-security prison on the Moon to take revenge on Men in Black (MIB) Agent K, who shot off his arm and arrested him in 1969. He eventually confronts K and his partner Agent J, telling the former that he is "already dead" before leaving. J and K fall out over the latter's efforts to stop him from pursuing Boris and refusing to explain what happened. At MIB headquarters, J's superior, Agent O, denies his request for further information on Boris' apprehension; only revealing that around the same time, K also deployed the ArcNet, an interplanetary shield that prevented the now-extinct Boglodites from invading Earth.
Boris obtains a time machine from Jeffrey Price, the son of a fellow prisoner named Obadiah Price, and travels back in time to July 16, 1969, to kill K, altering history. Though J retains his memories, he briefly suffers from strange side effects, which O identifies as signs that the space-time continuum was fractured before Earth is threatened by a Boglodite invasion. Recalling Boris will commit murder on July 15, 1969, J seeks out Jeffrey, obtains his own time machine, and travels back in time to stop Boris. However, he is arrested by a young K, who almost neuralyzes him until J convinces him of his mission. Following a series of clues, the pair reach the Factory, where undercover MIB agent Andy Warhol directs them to an Archanan named Griffin, who can view all possible outcomes and escaped to Earth after the Boglodites destroyed his planet. Sensing the younger Boris' impending attack, Griffin flees, but alludes to his future location. K and J later find Griffin at Shea Stadium and rescue him from the younger Boris.
As the present-day Boris arrives in the past and convinces his younger self to join forces with him, Griffin gives the ArcNet to K and J. After deducing the device must be attached to the Apollo 11 rocket to send it into Earth's orbit, J reluctantly reveals K's impending death. With Griffin revealing that only K can successfully attach the device, K encourages J to take the risk. The trio use jetpacks to reach Cape Canaveral, where Griffin advises the pair to tell the truth to the military police instead of neuralyzing them. They are apprehended by the colonel, but Griffin shows him the importance of their mission. The colonel subsequently assists them in reaching the rocket while Griffin leaves, assuring J that history will be restored once K takes Boris' arm. The Borises attack the agents, but they defeat them before K attaches the ArcNet. Present-day Boris falls into the launchpad's flame trench and is incinerated by the rocket's exhaust while the ArcNet is successfully deployed.
K reunites with the colonel, but the latter sacrifices himself to save him from the younger Boris, who goads K into arresting him. K refuses, killing him instead. K soon learns the colonel's son, James, was nearby and reluctantly neuralyzes him. Witnessing the events from afar, J realizes the colonel was his father and his younger self's presence kept him from forgetting K. Returning to a restored 2012, J reconciles with K while un-aged Griffin tells the viewers "this is new favorite moment in human history."