Encountering an uncharted planet in an empty region of space, Kirk and his crew are entertained by Trelane, a playful being who lacks the self-control to wield his great psionic powers with discipline.
| Creator | Gene Roddenberry |
|---|---|
| Actor | William Shatner, Leonard Nimoy, DeForest Kelley |
| Country | United States of America |
| Production | Desilu Productions |