In Doom (2005), UAC Facility scientist tested their mutations on criminals but they are turning into monsters instead of superhumans. According to Samantha, a scientist working as archaeological staff, a 24th pair chromosome make the human strong & cancerless being.

The extra pair makes her super strong, super fit, super intelligent.

Then why didn't happen like that?


It's genetic

Grimm determines that their genetics have been altered by the addition of the Martian chromosome; however, the chromosome seems to "choose" whether it causes the person to be superhuman or a monster, apparently able to determine on a genetic level whether a person has the capacity to be evil.


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