Andross Stark came back to prevent the Vortex Virus from creation, but inadverdently became the cause of its creation.
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#4
Suggested by
Shawn Mark
The 4 Dexters (kid, teen, hero & elder) Built robots to destroy the hero of the future (Dee Dee), but the they mistook the unbeknownst Dexter instead. Setting him on the path...i'm surprised (K) Dext