Cordelia, meanwhile, is on research duty, which is harder without Wes around. Some of his colleagues have clued her in to a plot--vampire, natch--to plunge the Earth into constant darkness, so that they might reassert their power without fear of daylight. She wants to help pervent this, but while she tends to Wesley it becomes clear that he is in the throes of a terrifying nightmare. If she can't rouse him, it may be the end--for him, as well as the rest of humankind....