A group of scientists each recruit one “regular” person to take part in a research project for a new sleep-aid device at a remote compound. Unbeknownst to the odd group of volunteers, the device’s real purpose is to place advertisements into people’s dreams. The experiment goes awry when the company financing the project pushes the technology for better results, blurring the lines between nightmares and reality, and leaving the ill equipped “plus one” volunteers to save the scientists from the chaos of a living nightmare.