Boris the Animal, a prisoner from LunarMax, travels back in time to kill Agent K, his captor. However, this alteration of the timeline is detected by Agent J, who also travels back to July 15, 1969, to prevent the assassination.

Men in Black 3
In the 1960s, a time-traveling agent must prevent a catastrophic future by altering the past, leading to a sidesplitting journey through the origins of the Men in Black organization.