As Mexicans are being smuggled across the boarder, the police pull them over.
Everyone is taken out of the truck and lined up.
Just then men from division six show up and begin asking everyone questions in Spanish.
When one of the Mexicans don't know what he is saying they take him into the desert and reveal that he is an alien living among common people.
The alien runs, but the men from division six shoot him.
Then they use the neurolizer to erase everyone's memory.
In New York, an undercover cop chases a suspicious man.
This is no ordinary man.
He can walk up walls and run very quickly.
The policeman chases the mystery man to the roof of a building.
Once he is cornered, the mystery man says that the world is going to end and then jumps off the roof killing himself.
Beatrice and her husband are having the usual country argument when they hear a thud outside.
Her husband goes to check it out.
The alien tells her husband to put his gun down and then kills him and wears his skin.
The alien, looking like her husband goes back into the house and demands sugar in water.
The policeman in New York is being questions about seeing aliens by fellow policemen when the same man from division six comes and bails him out and then erases his memory.
He then gives him his card that says MIB with an address on it and is told to be there at nine the next morning.
There are about nine other people in the room.
All of them are given a series of tests to be the next member in the MIB agency.
The policeman is the only one to pass and accepts the job.
The only drawback is that no one can know that he exists.
They will have to erase everyone's memory that he knows.
Will he save the world? Will he keep the aliens in line? Watch and find out.