[TOS] Season 3, Episode 11: Wink of an Eye
Episodes featuring the ship being commandeered always seem a bit more exciting, and the time difference concept makes it fun, but it seems like this episode could’ve been a lot better if they had thought through the concepts a little more.
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Read more at Memory Alpha
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Notes:

When they get back to the ship Kirk thinks something is touching him and he keeps hearing a bug noise

A little problem with this episode is how they switch back and forth between the perspective of those who are “accelerated” and normal people. With how much faster the accelerated people seem to be moving, it seems like the entire accelerated side of the plot would happen in about 30 seconds in normal time

Spock and Bones figure out a way to accelerate themselves, and how to return back to normal. It seems like those two potions would’ve come in handy in later episodes, and for mankind in general
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