On quiet, suburban Maple Street, somewhere in America, the inhabitants notice a meteor-like object fly overhead. After it passes, all electronics and electricity go dead.
A young boy named Tommy tells a story he read about aliens arriving from outer space. Believing his story, the people start to suspect each other of being secret aliens.
Pete Van Horn, leaves to check the next block over. Mr. Goodman's car mysteriously starts. Everyone accuses him of being an alien. Steve tries to talk some sense into the mob, but fails. He becomes a suspect as attention is directed to the radio in his basement!
The mob sees a figure coming towards them. Charlie grabs a gun and accidentally shoots Van Horn, who has returned. Suddenly Charlie's lights go on, and now he is the prime suspect.
Everyone is hysterical. Charlie screams that the real alien is Tommy, the young boy who knew the events before they happened.
In the end, aliens watch the town as it destroys itself. A simple trick by the aliens turned the residents against each other; they themselves were the monsters, not the aliens.