[TOS] Season 3, Episode 12: The Empath
I like the characters in this episode, but the plot feels too drawn out and predictable.
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Read more at Memory Alpha
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Notes:

My favorite part of the episode is when one of them must go to be tortured and Bones knocks Kirk and Spock out with hypos

The aliens say this was all to test Gem, to see if her people are worthy of saving, and so that she can learn to be as cool as Kirk, Bones and Spock
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