Body-controlling! Slugs that insert themselves into your ear and fold in around your brain like the worst, least comfortable blanket ever, and then see your every memory, feel your ever emotion, witness your every thought, and then keep you prisoner inside yourself while nobody around you notices. The Yeerks don't have eyes or tastebuds or ears really the way we do. They're blind, partly deaf, and entirely helpless in their natural state.
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