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.