New York City is being threatened by a villainous bug who has inhabited the body of a farmer. The mission is to locate and exterminate the bug before it destroys the planet.
The team has always protected the Earth from the scum of the universe, but in this new adventure, they tackle their biggest, most global threat to date: a mole in the organization.
Agent J needs help in his latest case, so he elicits the assistance of Agent K by restoring his memory. Together they battle the latest threat of aliens against Earth.
Agent J must travel back in time to MIB's early years in the 1960s and save his partner, Agent K, from being assassinated by an alien. Along the way, Agent J teams up with young Agent K and learns that there are secrets to the universe that Agent K never told him.