The movie is basically the tale of FBI agent Jack Kruger who works in the witness protection division. His job is to 'Erase' people, or basically stage their death so the bad guys will stop trying to kill the good guys. Then there's some plot with a sell out in the FBI, which they never bother to really explain, that wants to kill all international witnesses, including, of course, Kruger's.

From there, through in an organization that's illegally making some sort of super hand held weapon you could previously only find on battle ships because it was so big. In the end, you have a fun movie with plenty of excuses for Schwarzenegger to wield huge weapons and wreak havoc. A fun ride.