Episode Trivia

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Kirk tells the lieutenant "This far out we may never get help," but they are only 79 light years out. That does not seem too far for Star Trek travel and communication times.
   
No one knows who Apollo is until Kirk and his landing party beam down. Then Apollo introduces himself to the landing party only. But when Kirk finally manages to get hold of Spock later and talks to him about Apollo, Spock knows exactly what he's talking about, even though there's no way he could know about Apollo.
   
The Enterprise would later be held captive by a powerful alien who had visited Earth again in the animated episode "How Sharper Than a Serpent's Tooth?".