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The intelligent but reckless doctor William Birkin was the ingenious scientist who continued working on and perfecting the G-Virus formula after its original creation. Upon injecting himself with the virus, William began to mutate after each time he sustained critical damage. Believed destroyed by Leon S. Kennedy in the railway system of our Raccoon City underground facility, rumors have surfaced that William may in fact be alive and imprisoned by the traitor Albert Wesker.