Episode Title: Lord of the Flies
Lord of the Flies is also the title of a classic novel by William Golding published in 1954. It is the story of a group of schoolboys who are shipwrecked on a deserted island and must fend for themselves until they are rescued. The novel has no bearing on this episode, which is about a teenager who can control insects. It should be noted that in some Christian mythologies, the devil is also referred to as Lord of the Flies because both are associated with death. This may have been the source for Golding's use of the phrase.
Addition: It is widely believed to have been the source. It is a not quite literal translation of Beelzebub or Ba'alzebub. Baal means Lord in the Canaanite language. Beelzebub was the prince of demons, and usually shown covered in flies, and could control the insects, making it particularly fitting for this episode. And though the stories don't match, it's also about people trying to discover where they fit in in the world, with the outsider not turning out to be so good and exacting his revenge.