Shelter Skelter
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"Shelter Skelter" is an episode of the 1980s revival of The Twilight Zone.
Joe Mantegna plays a family man named Harry Dobbs obsessed with surviving a nuclear war. He even has built himself a fallout shelter in his basement. His wife, Joan Allen has taken the kids, one of them played by Danica McKellar, to visit her sister in another state leaving him alone. Suddenly, without warning a nuclear blast happens. Believing that World War III has begun he runs to the shelter. He survives on his wits alone as he is forced to turn away his friend Nick who arrived too late. Alone and unaware of what exists outside, he remains. Outside, however things are quite different....
World War III has not in fact happened. The nuclear blast was an accident, and its crater has been contained under a memorial which has sealed inside it all of the debris and radiation. The memorial was built right on top of Dobbs' house.