Men in Black 1

At the Mexico–United States border, two men in black suits, Agent K and Agent D, interrupt a border patrol sting. They take one of the men attempting to cross the border, who is an extraterrestrial in disguise named Mikey. When he tries to attack one of the patrol officers, K is forced to shoot him and erase the memories of everyone in the group, creating a cover story of an explosion in an underground gas pipeline. Deciding that he is too old to continue working, D chooses to retire and has K erase his memory.

NYPD officer James Darrell Edwards III catches an unnaturally agile fleeing criminal and sees his eyes blink unusually before he leaps from the roof of the Guggenheim Museum. During his interrogation, K arrives and scouts James as a potential new partner, impressed by his ability to chase down an alien. K explains to James that their organization, the Men in Black, was founded after first contact was made with aliens in 1961; at this time Earth was established as a politically neutral zone for alien refugees.