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(((New Intel))) the G-virus:It is a highly advanced strain of the Progenitor virus with continuous mutagenic properties.

The G-virus was developed by Umbrella Corporation scientist William Birkin, who had also taken James Marcus's work on the t-virus.
[A primitive form of the virus was discovered in the mutated body of Lisa Trevor, on whom the Umbrella Corporation had been conducting unethical genetic and viral experiments for three decades. When she displayed unexpected immune resistance to the experimental NE-Alpha parasite, Birkin and other researchers looked for a cause and found what would later become the G-virus.]

The G-virus, shown as a purple, aqueous liquid in a glass vial, greatly increases the host's metabolism, which accelerates cellular duplication and revitalization of dead cells. However, the continual destruction of mitochondria in the host's neurons causes an infected person to degrade to sub-human levels. The host exhibits animalistic behavior, loss of moral reasoning and memory, and becomes driven by self-preservation. Ultimately, carriers become creatures simply dubbed "G".

Beyond these qualities, the mutations induced by the virus tend to be extremely volatile. The only known hosts were William Birkin, his daughter Sherry, Curtis Miller and Dexter Whitlam. William injected himself with the virus after being mortally wounded by an Umbrella Security Service unit attempting to recover the G-virus from his labs. Unlike t-virus hosts, G-virus hosts never stop mutating, even without external stimuli, thus causing transformations akin to a sort of artificial evolution, accelerated to levels impossible to be recreated in nature. G-Carriers evolve even faster when wounded, due to the incredible regenerative capabilities of infected cells. Curtis injected himself to denounce the "atrocities" by the WilPharma company, which, in its quest to create a viable "t" vaccine, had apparently infected countless people to use as guinea pigs. Sherry was infected by William. As their DNA matched, she was destined to become like him. The mutations were stopped before beginning.

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This was demonstrated by the changes seen upon Curtis Miller, whose changes were influenced as well by the injuries he sustained, and developed characteristics vastly different from Birkin, such as an elongated prehensile tail, height beyond ten feet, and an initial phase upon which he was still practically fully conscious; all of this, even though he retained a massive eye and claws as a nod to Birkin's changes. It also appears as though a separate, conscious mind and independent brain is created in every G-Mutant; Curtis initially retained his mind and consciousness until the eye on his shoulder spotted his sister, then the animalistic side took over.