Calling himself a cleaner, the mysterious Leon is New York's top hit man. When his next door neighbors are murdered, Leon becomes the unwilling guardian of the family's sole survivor, 12 year old Mathilda. But Mathilda doesn't want protection--she wants revenge. Training her in the deadly tricks of his trade, Leon helps her track the psychotic agent who murdered her family.

New York cab driver Korben Dallas didn't mean to be a hero, but he just picked up the kind of fare that only comes along every five thousand years: a perfect beauty, a perfect being, a perfect weapon. Now together, they must save the world.