There was a sound and a boom of light that went across the sky. Everbody's machines stopped working and people started to turn on each other.
Tommy told stories of aliens to the crowd after the flash of light went down. Then, all of the sudden, Les Goodmans car shot up. People started to blame him as the alien. Later in the story, after they blamed numerous people, a dark figure comes out of the darkness.
After the figure had emerged from the darkness, Charlie had shot the "monster". In closer inspection, Charlie had realized he had shot Peter Van Horn and begged for comfort.
After Pete got shot, people started to go crazy and brake into houses. Then, all of the sudden, all the lights in the neighbor-hood started to flicker. Hence, more people were blamed and more houses were broken into.
In the end, we learn that the flash of light was a ship. There were 2 figures on the ship and had explained how this little town was alike many others, how people are the same.
This episode (or drama) was to show how fear can easily turn people against each other, how we can destroy ourselves so easily.