Ghost is just that a dead human woman. A former lieutenant in the Terran forces she died during the purge that wiped out humanity. Trapped inside the very technology that gives her existence. She is a loyal crewmate and is willing to sacrifice anything for Adam. She has seen numerous changes to her character over the years. From being just the voice of the ship on the radio show to a love interest for Adam in the comics of the sixties. Ghost is and enduring part of the Zero Universe.