As Charles Evans, the lone
survivor of a
crashed colonizing expedition to the planet Thasus, comes aboard the
Enterprise from the S.S. Antares, but when Captain Ramart of the
contacts Kirk about Charlie, the S. S. Antares is suddenly destroyed.
shows not only a lack of grief for the people who had become his
benefactors, but almost an indifference to their deaths. He seems only
concerned that his new "family" like and accept
him. Unfortunately, teenage hormones and an isolated upbringing make
events occur whenever Charlie is angered — he makes Yeoman
Rand disappear when she rebuffs his advances, he breaks Spock's legs
when the Vulcan tries to discipline him, and he causes injury and
discomfort to anyone who he thinks is laughing at him.
demands that the U.S.S. Enterprise take him to the nearest inhabited
planet, but Kirk fears that his uncontrolled temper and dangerous
powers will create havoc for any civilization. Charlie gains control of
the ship, but Kirk shortly overcomes him. Suddenly, an alien face
appears on the bridge. It is that of a Thasian, the race who raised
Charlie and gave him his extremely powerful psionic powers.
Thasians had realized that Charlie has left their planet and thus sent
their own starship to intercept the Enterprise. Despite Charlie's
tearful pleas to remain, the Thasians take the lonely child back to
Thasus. Before they depart, the beings restore the U.S.S. Enterprise
and her crew to normal.