Nightmare Scenario is a Starfinder adventure for four 3rd-level characters, continuing the 3-volume Drift Crashers Adventure Path. Drift Crashers is part of the Drift Crisis, an event taking place across the entire Starfinder game line, in which faster-than-light travel breaks down and the galaxy is thrown into chaos. In addition to the adventure itself, this book includes an article expanding on Desna and her church in the Starfinder setting, a gazetteer of her home plane of Cynosure, and an Adventure Toolbox filled with new rule options and strange alien creatures.