Character finds himself immobilized, unable to communicate with anyone, and unlikely to be removed from this situation--not even by death--anytime soon.
Usually, when this arises, it is eternal (unless someone finds them and reverses it, which is common if this is happening at the beginning or middle of the story instead of the end), but non-infinite cases are possible (for instance, a robot with a 100-year battery life, buried underground).
The worst case scenario for tropes such as Sealed Room in the Middle of Nowhere
, Involuntary Shapeshifting
, and Who Wants to Live Forever?
, and a rich well of Nightmare Fuel
As implied by the working title (which isn't very good--need a better one), I Have No Mouth And I Must Scream
ends with someone being put into this situation via Involuntary Shapeshifting
. And since this is me starting the YKTTW, you know there must be a Pretty Cure
example; in this case, Michiru and Kaoru spend nearly half of Futari Wa Pretty Cure Splash Star
paralyzed at the bottom of a lake, and at the start of Yes! Precure 5
, Nuts was trapped inside the then-unopenable Dream Collet.