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Traveling through supposedly empty space, the Enterprise finds itself caught in the orbit of a previously uncharted planet with one rather bizarre inhabitant in this installment of the original Star Trek television series. Unable to free the ship, Kirk leads an expedition to the surface to investigate. There, the Enterprise crew encounters Trelane, an annoyingly chipper alien who dresses and lives as a 17th-century European squire. But despite his foppish appearance and immature actions, Trelane proves to be remarkably powerful when challenged, and he soon holds the crew members at his mercy. Unable to defeat him with brute force, Kirk and the others must play along and find another method of escape, or else become Trelane's playthings for the rest of their lives.