Seemingly unphased by the death of all of the adults on the expedition, Mary and the other children became unwilling followers of the entity known as Gorgan. When they were eventually rescued by the crew of the USS Enterprise, Gorgan coerced Mary and the children to take the Enterprise to Marcos XII and spread his evil persuasion. During the takeover, Mary accompanied Tommy Starnes on the bridge, where they maintained control of the ship. (TOS episode: "And the Children Shall Lead")
- The novelization of TOS episode: "And the Children Shall Lead" by James Blish, gives Mary's last name as Jaworski.