My absolute favorite episode of any Star Trek series Star Trek the original series The Doomsday Machine ... Complete with the old cheesy special effects where you actually had to make something happen as inexpensively as possible, rather than just press a few buttons and run a computer program...
https://www.youtube.com/watch?v=mN4vMBdicBg
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I agree with a comment that I saw on the video that this episode should have won many awards back then in the mid 60's including a Grammy for the score and say what you will about him but William Shatner should have won an Emmy for this episode...