The Twilight Zone: The Shelter

This is the only episode of The Twilight Zone I can think of where there wasn’t anything even remotely supernatural.  No aliens, no psychics, no monsters; just scared, powerless people in a panic and feeding off of each other’s fear.  As we all know, that’s the scariest thing of all. 

Astute nerds will recognize this plot from its parody in The Simpsons’ epsiode “Bart’s Comet.”