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!"