Let's consider the situation if he isn't dead. Unless he was displaced into a cavern, I'd say it has to get light at some point soon. It's warm enough for water to exist as a liquid and there is sufficient oxygen in the air for him to breathe. The heat to keep the water liquid and to power the photosynthesis that is the source of that oxygen, logically, must come from a sun. He might well end up lost and starving, but I don't think he'll wander in darkness forever. People not infrequently get lost and die in real life, which is scary, but not horror story scary.
Stephen King has touched on the idea of temporal and spatial displacement a couple times I can think of. Temporally in The Langoliers which I have read. I tried, unsuccessfully, to sit through the movie. I thought the titular creatures rather silly, but other parts of the story were more successful. How "dead" everything was in the past was a neat idea. Later, in From a Buick 8, King played with spatial displacement. That was a much more effective story, IMO. Our world and the other one were lethally incomprehensible and incompatible to each other. A being from either side would die in fear, confusion, and agony on the opposite side. That is horror story scary.