This episode was down right creepy.
In a city of the future, children are required to take an intelligence test at the age of twelve. This is classic Twilight Zone switch-a-roo.
One would think that if the kid didn't score high enough, that something bad would happen. The reverse was true in this case. If the kid scored too high, he was exterminated.
This particular episode reminded me of the classic tale when the woman had facial surgery in the hopes of becoming "normal." In the end, she appeared normal, but the doctors looked all messed up. This was the same kind of role reversal.