Overview:More than 50 years ago, South American scientists attempted to cross-breed bees that would produce more honey than ever before possible. But instead, they created a monster. Today, these giant bees are on the loose, spreading northward and invading US cities. MonsterQuest examines how these killer bees attack with an unseen ferocity and discovers that the bees may be adapting to colder temperatures, making them an even greater threat.