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Most of Jill’s role in Resident Evil 5 is told through flashbacks and documents, unless you have the Gold Edition or Untold Stories Bundle that let you play through Lost in Nightmares — of course, once you reach a certain point in the main game, that is. It gives players the chance to experience the night that Jill allegedly died saving Chris. Of course, you know by then that Jill isn’t actually dead. You also get to see that she looked rather different during that night than she does when you encounter her in the main game.
What Happened to Jill’s Hair

If you spend your time exploring areas and reading the various documents scattered throughout Resident Evil 5, you’ll find a document called “Test Subject Data.” Inside this file, it describes Jill as having been in medically induced stasis for an extended period of time. While her vitals are all normal, there’s a note about abnormal pigmentation that’s limited to her hair, hence her hair going from brown to blonde. It also notes that her skin has become paler, but that’s more difficult to notice unless you’re looking at both versions of Jill side-by-side.
Essentially, Wesker made Jill into a test subject, and it seems like those tests caused a pigmentation abnormality. During these experiments, Jill unexpectedly became a necessary resource for Wesker that allowed him to improve his Uroboros virus. This is because he tried infecting her with a previous strain, but the dormant t-Virus antibodies in her body from the events of Resident Evil 3 protected her from the virus. Naturally, Wesker used this to improve Uroboros before he would then turn Jill into his lackey with the help of a drug that kept her under his control, knowing that it would hurt Chris to fight against his old partner, whom he believed to be dead. She also acts as a great distraction since Wesker only has seven minutes he can spare to play with Chris.
How Jill Became a Test Subject

The event is shown in Lost in Nightmares, and they are set between Resident Evil: Revelations and Resident Evil 5. Chris and Jill return to Spencer Mansion, having picked up a lead that Wesker would be there. Wanting to finally end their boss-turned-nemesis, Chris and Jill follow this lead and enter the building where their biohazardous journey first began. As the DLC’s name suggests, this mission turns into a nightmare.








