[TOS] Season 2, Episode 24 (Netflix: S2 E24): The Ultimate Computer
Rating: 2
This episode covers themes of machines/computers replacing people. If you find this theme interesting you’ll probably like this episode. The story plays out how you would expect, and Kirk even talks the computer to death.
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Read more at Memory Alpha
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Notes:

Kirk wants to go down to a planet with Bones and a geologist. The M-5 recommends sending different people because Kirk is “non-essential personnel”. Doesn’t the computer know that Kirk is the main character and gets to go everywhere?

Kirk convinces the computer that it’s murdered people, and the computer believes the punishment for murder is death, so it kills itself
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