Re: Never seen TOS scenes (revisit)...
In February 1964, The Outer Limits did an episode called "The Invisibles", with alien creatures resembling crabs that were forcibly placed on men's backs to turn them into mind-controlled slaves.
The crab creature:
Now that's where the Ceti Eel idea came from? And the "Keeper" in BABYLON 5
And of course, fantastic and passionate work you present here, Warped9
I don't want to imagine how much time you spent on researching usable materials.
"The first duty of every Starfleet officer is to the truth, whether it's scientific truth or historical truth or personal truth! It is the guiding principle on which Starfleet is based! Jean-Luc Picard