Mark agonized over the loss of his loved ones.


    He worked countless days/nights on his new invention to time travel.


    After thorough research, he determined the ''exact intersection'' to stop the ''pandemic.''


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    Mark arrived at its ''beginning''—searched for, found, and killed ''patient zero.''


    He returned to the present …


    More people had died than before.


    Mark traveled to the past again, over and over, at different days/hours/months.


    Each trip caused more devastating consequences.


    Until the encounter ...


    Mark traveled again to the past and saw himself running up to him while pointing a gun—"This is how it ends!"