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Curtis Jackson (John Cusack) a writer and researcher, believe that the prophecy will happen. Jackson tried his best to prevent this from happening. Armed with his knowledge of the ancient prophecy, Jackson and then find a way to open a portal between dimensions to meet 'her other' in dimension.
Jackson convinced only through the boundary with the parallel world that is the only way to prevent the disaster that was predicted Mayan peoples. But Jackson had to do it before the date of December 21, 2012 because the Mayan calendar there is no date after that date.