Star Trek is an American science fiction television series. Tos stands for The Original Series

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Physiological changes in Klingons between Star Trek TOS and Star Trek TNG

I grew up watching Star Trek: The Next Generation, thus I always took it for granted that Klingons look like this: Now I'm watching Star Trek: The Original Series for the first time (thank you, ...
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Star Trek - Khan and Chekov

Why does Chekov say that he remembers Khan in "Star Trek: The Wrath of Khan" if in Star Trek TOS Chekov doesn't appear in the episode "Space Seed"? Also why is Chekov in "Star Trek Into Darkness"? ...
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Why did they *kill* Mr. Hengist in “Wolf in the Fold”?

In the season two episode of Star Trek, “Wolf in the Fold”, they discover that there is a non-corporeal entity that has been going around the galaxy committing murders for a very long time. During ...
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Star Trek TOS Season 2 - how long does the change in musical style last?

The tone of the music of Star Trek changed dramatically from Season 1 to Season 2. Whereas Season 1 was subtler (as subtle as it could be being a science-fiction show in the 60's), and the title track ...