Lieutenant Sharon McGuinness was a human disgusted by the scientific going-ons concerning Colonel Doctor Paul Church. She was also displeased to learn that David, a man whom she'd been close to, was also Church's lover. Possibly a carrier of the Telepathine drug, she is able to escape and intimidate the Xenomorph Trixie and do nasty damage to Church.

However, she fails to kill him and her own fate is unknown.