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|Men in Black character|
Tommy Lee Jones portraying Agent K
|First appearance||Men in Black|
|Created by||Lowell Cunningham|
|Portrayed by||Tommy Lee Jones (Original)
Josh Brolin (Young)
Postal worker (Men in Black II)
|Birth name||Kevin Brown|
Agent K (born Kevin Brown, also known as Kay, or simply K) is a fictional MIB agent in the film Men in Black, its sequels Men in Black II and Men in Black 3, and Men in Black: The Series. Kay is portrayed by Tommy Lee Jones in the three films and voiced by Ed O'Ross and Gregg Berger in the animated series. The film's trading card series and Men in Black: The Game note Agent K's name to be Kevin Cunningham, a nod to Lowell Cunningham, the creator of the comic.
Fictional character biography
K (born Kevin Brown) was one of the people who made first contact with the first aliens to arrive on Earth, and became one of the founding members of the Men In Black. On July 16, 1969, K saved the world from invasion by attaching the ArcNet, a planetary shield, to the Apollo 11 rocket so that it would be deployed in space. In the process, K severed the left arm of the Boglodite invader 'Boris the Animal' and arrested him for the murder of U.S. Army Colonel James Darrell Edwards II. K also had a romantic relationship with Agent O, which he discontinued afterward. In 1975, the Zarthan Queen Laurana came to Earth and K fell in love with her. Laurana was eventually murdered for the Light of Zartha (a source of power located in her daughter Laura) by the alien Serleena. K faked sending the Light off-planet, and erased his own memory to prevent her discovery.
Men in Black
In the first film, K recruits Agent J (Col. Edwards' son), to stop a "Bug" (one of an alien race who feed on carnage caused by wars) from stealing a miniature galaxy before the Bug's enemies destroy Earth to prevent the theft. During the final confrontation with the Bug, it swallows the agents' guns, and K decides to let the Bug swallow him so he can get his gun back, while J distracts him from leaving Earth. Just as the Bug is about to eat J, K shoots it from the inside, and Dr. Laurel Weaver (a morgue worker whom the Bug kidnapped) finishes it off. K later requests that Agent J erase K's memories of his time with the MIB so that he can reunite with a woman he had loved before joining the MIB.
As the Men in Black animated series takes off from the end of the first film, but skips the plot after Dr. Weaver destroys the Bug, Agent K remains as Agent J's partner while Dr. Weaver has joined the MIB as a medical doctor at the MIB Headquarters. It is revealed early on in the series that a man known as Alpha was the founding Chief of MIB, and K's mentor, but later turned criminal. 
Men in Black II
In the second film, at a post office in Truro, Massachusetts, Kevin Brown is recruited anew by Agent J, to recover the 'Light of Zartha'. After rescuing Laura, they fend off Serleena so they can send Laura safely off the Earth and back to her home planet.
Men in Black 3
In the third film, Boris the Animal time-travels to 1969 and murders a young K (Josh Brolin), allowing the Boglodites to successfully invade Earth, and J travels back to 1969 to save his mentor's life and prevent the oncoming Boglodite invasion. When J arrives from the future to kill Boris at Coney Island, K arrests J and takes him to MIB headquarters, where J reveals his mission. Thereafter the precognitive alien 'Griffin the Arcanian' guides J and K to Cape Canaveral, Florida, where Col. Edwards helps them launch the Arc-Light, but dies in the process; whereupon K kills Boris. It is then revealed that Col. Edwards is J's father.