Miri

After discovering what appears to be a duplicate of the planet Earth, Captain Kirk and his landing party find a population ravaged by a strange disease, which has two effects: children are granted extraordinarily long life, but anyone who reaches puberty (including the adult landing party) develop painful sores which eventually kill the infected. The oldest child, a girl named Miri, develops a jealous affection for Captain Kirk, and works with the other children to kidnap Janice Rand after Kirk attempts to comfort the frightened yeoman.[37]