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In episode 7, "The Naked Time," an alien disease that strips inhibitions from individuals affects the
Enterprise crew. Sulu (George Takei) frees the swashbuckler in his soul, Kirk (William Shatner) battles his demons, and a young lieutenant, Riley (Bruce Hyde), serenades the entire starship and steers it toward certain doom. Still early in the proceedings, this episode introduced a psychological aspect that would become a cornerstone for the storytelling on all four
Trek series.
--Tom Keogh
From the Back Cover
Sent to pick up a research team, the
Enterprise finds the scientists dead. One member of the landing party brings a disease back to the crew, forcing suppressed emotions to the surface.
TREK TRIVIA
Bruce Hyde (Kevin Riley) and Stewart Moss (Joe Tormolen) both appeared in later Trek episodes - "The Conscience Of The King" and "By Any Other Name", respectively.
"The Naked Time" includes the first of many playful fights between Spock and McCoy and features Spock and Tormolen wearing black T-shirts under their uniform tops during their medical examination. "The Naked Time" was paid tribute by The Next Generation's first one-hour episode "The Naked Now".