In my opinion,this is one of the best Macgyver episodes ever made,and is one of my favorite (if not very favorite) episodes. First,the opening is one of the best ever done. Macgyver stops armed robbers inside a grocery store with homemade tear gas made from items from the store's shelves.
The main plot starts when Macgyver's new colleague,Nikki Carpenter,is mugged outside of a post office that is bombed shortly after. Later that day after the same man tries to run her over with his car,she comes to Macgyver for help. Macgyver then finds out the man who mugged her is a local guy helping two men who want a terrorist (who Pete Thorton helped lock up a few weeks before named Marcus) out of jail. That night when the same guy again tries to kill her by breaking into her apartment,the trail leads Macgyver to the men who are behind the post office bombing. But it ends up the post office was only their first warning,and Macgyver soon finds out what they plan to blow up next: The Hall of Justice in downtown LA using a mail truck filled with explosives. The show reaches it's climax as Macgyver drives the truck away from the Hall of Justice,and has a construction worker fill it with cement to stop the explosion.