Their time travel calculations are a little off and they find themselves in Dallas , Texas on 22 November 1963 . They appear at the Texas School Book Depository just as Lee Harvey Oswald is firing at U.S. President John F. Kennedy . They inadvertently knock him out the window to his death below , thereby preventing Kennedy 's assassination . Confronted by the local police , the crew use the time travel device to go three years forward to 1966
firing
Assassination of John F. Kennedy
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