In this episode, the advance of Killer Bees, originally imported to South America from Africa, and their march northward into Central America, Mexico, and their eventual expected entry into the United States is investigated. We look at what these bees have done and their impact on Brazil, and other areas into which they have moved. The deadly threat they pose to humans and animals when disturbed, their interbreeding with domestic bees, and their possible impact on the U.S. if their advance is not stopped before they reach America. This is one of the episodes that is a bit dated since killer bees have now invaded the United States and have been responsible for the deaths of several humans and animals.