The scariest episode of the original Twilight Zone, It’s a Good Life, features a powerful and petulant six-year-old boy who destroys the world and demands that everyone think good thoughts about him.

“A monster had arrived in the village. Just by using his mind, he took away the automobiles, the electricity, the machines, because they displeased him. And he moved an entire community back into the Dark Ages, just by using his mind.”
Rod Serling introduces the Twilight Zone episode It’s a Good Life (Season 3, Episode 8):
Tonight’s story on The Twilight Zone is somewhat unique and calls for a different kind of introduction. This, as you may recognize, is a map of the United States, and there’s a little town there called Peaksville. On a given morning not too long ago, the rest of the world disappeared, and Peaksville was left all alone. Its inhabitants were never sure whether the world was destroyed and only Peaksville was left untouched, or whether the village had somehow been taken away. They were, on the other hand, sure of one thing – the cause. A monster had arrived in the village. Just by using his mind, he took away the automobiles, the electricity, the machines, because they displeased him. And he moved an entire community back into the Dark Ages, just by using his mind. Now I’d like to introduce you to some of the people in Peaksville, Ohio. This is Mr. Fremont. It’s in his farmhouse that the monster resides. This is Mrs. Fremont. And this is Aunt Amy, who probably had more control over the monster in the beginning than almost anyone. But one day she forgot. She began to sing aloud. Now the monster doesn’t like singing, so his mind snapped at her, and turned her into the smiling vacant thing you’re looking at now. She sings no more. And you’ll note that the people in Peaksville, Ohio, have to smile. They have to think happy thoughts and say happy things because, once displeased, the monster can wish them into a cornfield, or change them into a grotesque walking horror. This particular monster can read minds, you see. He knows every thought, he can feel every emotion. Oh, yes, I did forget something, didn’t I. I forgot to introduce you to the monster. This is the monster. His name is Anthony Fremont. He’s six years old with a cute little-boy face and blue guileless eyes. But when those eyes look at you, you’d better start thinking happy thoughts. Because the mind behind them is absolutely in charge. This is the Twilight Zone.
Serling closes the episode:
No comment here. No comment at all. We only wanted to introduce you to one of our very special citizens, little Anthony Fremont, age 6, who lives in a village called Peaksville, in a place that used to be Ohio. And if by some strange chance you should run across him, you had best think only good thoughts. Anything less than that is handled at your own risk. Because if you do meet Anthony, you can be sure of one thing: you have entered the Twilight Zone.
Below is a five-minute clip from the episode. If you can and are willing, you will find this episode streaming. It was originally scary, but today you might find it scarier that a man-child with infinite power demands that people have good thoughts about him—or else.
The Twilight Zone.