Kynthia is one of the Chosen. As soon as she saw Jack, she fell in love with him and gave him the marriage cake, which he accepted since he did not know the customs of the Argosians. Neither did he know that the cake contains some drug. He had intercourse with the young woman, who was then thirty-one days old. This relation caused Jack to be infected with the nanites that make the Chosen age so fast.

The Colonel aged even faster than them, gaining five to ten years old a day until a solution was found to stop the nanites. Kynthia remained at his side until he left Argos, once he was cured.