Jill Valentine was a former member of STARS and the BSAA. On one BSAA mission Jill and her partner Chris Redfield teamed up to stop Wesker at a mansion. Seeing Wesker about to kill Chris, Jill tackled Wesker out of a window to sacrifice with the two being presumed dead. However Wesker implanted a device on Jill named P30 giving Jill superhuman abilities like superspeed and strength. The device also brainwashed to do Wesker’s bidding. The parasite is located on her chest. It makes Jill unstable.