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Just before Halloween, three young brothers alone in a big house are menaced by three escaped mental patients who have murdered some traveling circus clowns and taken their identities.

In 2176, a magnetic storm erases all recorded history, including the U.S. Constitution, so, three time travelers are sent back to July 4, 1776, to retrieve the heritage, but end up in 1976's Bicentennial, while being perceived as aliens.