 The escaped alien criminal Boris the Animal time-travels back to 1969 and murders a young K, which could result in the end of the world as K was no longer present to establish a force-field that could permanently protect Earth from invasion by the Boglodites (Boris' species).J tracked the time jump device owner and showed him the invasion, as a reason to save K. Thanks to "being there" when the major moment in history changed (the installation of the ArcNet), J was able to retain all memory of K. J travels back to 1969 to save K, although hampered by his lack of knowledge of K's personal life or the specific details of the case that killed him.J then traveled back to 1969, where he meets the younger K. To keep the present unchanged by Boris's interference, J advises K to kill the Boglodite instead of arresting him as in the original timeline.