After multiple bodily injuries, the X-Men began to replace their bodies with cybernetic parts. Eventually, this lead to their entire bodies being replaced after their original bodies aged beyond use. They downloaded their consciousnesses into cybernetic bodies designed after their original costumes. Their cybernetic brains began to become crowded from too much information, breaking their mental faculties, leaving only the purpose to save mutantkind in their minds. They became the X-Sentinels and started to hunt humans and leaving only mutants safe.
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