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Answer: McCoy's place is aboard the Enterprise. If they fail to deflect the asteroid, everyone left on the planet, including McCoy if he remains behind, will be killed. If they are successful, then both Spock and McCoy can return to continue searching for Kirk. McCoy, being a Star Fleet officer and a doctor, knows that his first duty is to the Enterprise and its crew. "The needs of the many outweighs the needs of the few, or the one," certainly applies here, and it is what Kirk would have expected of him.

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Answer: Spock is also half-human and does not entirely look like a typical Vulcan. Mudd likely noticed that.

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Answer: It's not explained. However, Gary Seven was originally supposed to be a character in a separate TV show. A pilot was filmed, but the show never materialized. Footage from the pilot was later incorporated into the Star Trek episode, "Assignment Earth." Presumably, some of the footage that was used didn't fully relate to or explain the revised plot, creating inconsistencies. Also, at the end, Spock tells Seven that he and his new team have, "many interesting experiences ahead of them." That could indicate the unused I.D. was intended for a future purpose.

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Answer: It's not explained. If a character is not integral to the plot, there's no reason for them to reappear.

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Answer: There's no explanation. He may not have completely adjusted to living there or gotten around to getting new clothing. He was also still a member of Star Fleet and would wear his uniform until he formally resigned. TV shows back then were cheaply made and rather lax about details like that. They may simply have deemed it unnecessary to change McCoy's costume. It could also be interpreted as foreshadowing that he would return to Star Fleet. Also, in all the Star Trek series, miscellaneous characters would often wear only one outfit, even though the story may take place over many days. In the early days of TNG, Counselor Troi wore the same outfit in nearly every episode until she started wearing a uniform later in the series. The practical logistical reason for a character wearing one costume is that it maintains continuity for the post-production editing process.

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Answer: There's no explanation. It could be that there are a variety of uniforms that personnel can wear, or regulations have changed. Most likely, it was a production choice to make subtle changes to the costumes.

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Answer: If you're referring to Dress, Combat, etc, then the answer is obvious. If you're referring to green vs gold, then the answer is, "He didn't" - it was always green. The lighting and colour processing method of film back then made the green appear yellow on screen. Although there WERE a couple of green uniforms that were made of different material, one being more reflective than the other, so one always consistently looked yellow on screen, and the other occasionally looked its true green colour. But not often, the lighting AND post-processing had to be perfect to show the green.

Answer: It is never revealed how Spock knew this. This is either an educated guess on his part, or else Spock, who is intellectually superior to most humans, has a particular interest in or knowledge of ancient Earth history and is familiar with different types of weapons.

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Chosen answer: This was an early episode and TV shows often make small changes to set design, props, equipment, and so on as the program progresses. Most likely it was felt that this particular prop was not effective and the producers decided to eliminate it.

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