Someone calling himself "Kaili" (the Hawaiian god of battle) wages his own personal war against polluters. At first the pranks are bad but not dangerous, like climbing a ladder to the top of a huge chimney with a 125-pound ceremonial shield and capping the chimney (thus blowing out the furnace inside and chasing everyone out of the factory). However, Kaili's actions get steadily more violent. After blasting a crop-dusting plane with a shotgun (he pulls the pilot to safety), Kaili types up a list of the five worst polluters in Hawaii and entitles it "Kaili Death List." One of the five suffers a heart attack and another flees, so Kaili goes after the most heavily guarded of the three and breaks his neck with one hand. Can Five-O identify Kaili (whose face is never really seen) and capture him without getting shot or beaten to death?
—Peter Harris