Neural-Puppetry

Insidious motor cortex hijacking and neurological overrides executed via subdermal hardware implants, psionic signals, or biocomputer relays to command an external target's muscle movements and physical actions while keeping their conscious mind isolated and helpless.

The horror of being a helpless passenger in your own body, aware of your actions but unable to stop them. It's the ultimate loss of autonomy, a terrifying violation of self where your limbs move to your puppeteer's will.