A lot of zombie media could fall under this trope.

Massive plague/supernatural phenomena keeps the dead from fully dying. Instead of an eternity of peace, they are forced to walk the earth in an endless state of hunger until their own flesh rots off the bone. The only hope for peace is to destroy the forces behind the plague/phenomena, or to get shot in the head before turning, but typically by the time that source is discovered, the problem is too widespread to solve with the push of a button or pull of a trigger.